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Lenovo Flex 5 (15-inch) review: A big screen 2-in-1 at a mainstream price

It might be bigger than Lenovo's other two-in-ones, but the 15.6-inch Flex 5 is a well-rounded multimedia machine.

Joshua Goldman Managing Editor / Advice
Managing Editor Josh Goldman is a laptop expert and has been writing about and reviewing them since built-in Wi-Fi was an optional feature. He also covers almost anything connected to a PC, including keyboards, mice, USB-C docks and PC gaming accessories. In addition, he writes about cameras, including action cams and drones. And while he doesn't consider himself a gamer, he spends entirely too much time playing them.
Expertise Laptops, desktops and computer and PC gaming accessories including keyboards, mice and controllers, cameras, action cameras and drones Credentials
  • More than two decades experience writing about PCs and accessories, and 15 years writing about cameras of all kinds.
Joshua Goldman
4 min read

Editors' note: Lenovo has updated the 15-inch Flex 5 with eighth-generation Intel processors. A similarly configured version to the one reviewed here is available with new processor choices.


Lenovo Flex 5 (15-inch)

The Good

Following the form of Lenovo's slimmer, smaller Yoga two-in-ones, the Flex 5's 15.6-inch display gives you more room for work and, complemented by its speakers, makes it very good for video, music and games. It also has plenty of battery life to get you through the day.

The Bad

Outside of its 360-degree hinges, the design is basic and it's a bit too big and heavy to use comfortably as a handheld tablet. The exhaust fans do get loud under load.

The Bottom Line

The 15.6-inch Lenovo Flex 5 makes a nice alternative to a traditional mainstream laptop, especially if you've got entertainment in mind.

Lenovo's Yoga two-in-one laptop line is so varied in sizes and configurations that it can be very difficult to nail down the differences between them. To further confuse things, the Yoga 520 is called the Flex 5 in the US and it comes in two sizes, one of which -- the 15.6-inch model reviewed here -- is only available in the US. 

The 15.6-inch Flex 5 starts around $600 and goes up to $1,110 (that's about £780 or AU$1,430). The configuration I reviewed is a sweet spot in the line, delivering a good balance of performance, features and battery life. Lenovo makes a 14-inch Flex 5, too, that's alternatively named the Yoga 520 for the UK and Australia, but none of them can be configured quite the same as the 15.6-inch Flex 5. 

The larger 15.6-inch screen size makes it a good choice for those who want to have one computer for work and entertainment, while still being portable enough for throwing in a backpack or briefcase. Plus, the bigger two-in-one design is great for watching movies or giving presentations, and this system's discrete graphics even allow some low-level gaming. That said, if you are going to do a lot of traveling or need something for a daily transit commute, you may want to go with something smaller and lighter like the 13.3-inch Yoga 720. (The 720 also comes in a 15.6-inch size, but more on that later.)

Lenovo Flex 5-1570

Price as reviewed $850
Display size/resolution 15.6-inch 1,920x1,080 touch display
PC CPU 2.7GHz Intel Core i7-7500U
PC memory 8GB DDR4 SDRAM 2,400MHz
Graphics 2GB Nvidia GeForce 940MX
Storage 256GB PCIe SSD
Networking 802.11ac wireless, Bluetooth 4.1
Operating system Windows 10 Home (64-bit)

The 15.6-inch Flex 5's 4.4-pound weight (2 kg) and larger size make it a bit unwieldy to use handheld as a tablet. Set it down on your lap or a table and the extra screen space is really nice to have, particularly for configurations with the pen-enabled full HD display. (It's also available with a 4K UHD-resolution display, but it doesn't support an active pen and the higher resolution typically shortens battery life.) 

While the screen's brightness and color quality are very good, it doesn't get quite bright enough to combat the glare off the glass panel. Trying to use this under bright lights or outside was frustrating. Otherwise, the full HD screen I tested was excellent for photos and video and was responsive to both fingers and Lenovo's Active Pen.  

Lenovo Flex 5 1570

The 15.6-inch 2-in-1 design makes the Flex 5 excellent for entertainment. 

Sarah Tew/CNET

The 360-degree hinges paired with the larger screen is also valuable for getting the keyboard out of the way so you can focus on the display for video or presentations. Or you can hook up an external keyboard and mouse for more of a desktop experience. There are two USB 3.0 ports -- one on each side -- and a USB Type-C 3.0 (gen 1), an SD card reader, an HDMI out and a combo mic/headphone jack, so there are plenty of connection options to go around, but you'll need an adapter for Ethernet. 

When you're away from your desk, this system's keyboard, touchpad and speakers all offer solid performance. The backlit keyboard has just enough travel and snappy response to make typing comfortable for long stretches and the Windows precision touchpad is smooth and responsive without any jumpiness. The speakers are loud, with good clarity and adequate bass. You'll still be better off with headphones or external speakers if you're trying to hear over the system's fans when the laptop is under load, though. 

Streaming all day long

There are several configurations available for the Flex 5, so your performance is going to vary depending on what you get. The combo I had proved to be a good balance of performance and price. Its seventh-gen Intel Core i7-7500U processor is the top offering, but you can get it with a Core i3-7100U or i5-7200U. Other choices include 8GB or 16GB of memory; 256GB or 512GB PCIe SSD or a 1TB 5,400rpm hard drive, or a 1TB 5,400rpm hard drive plus a 512GB PCIe SSD; and Nvidia GeForce GT 940MX or integrated Intel HD Graphics 620. 

Though it's not necessary for general use, the 940MX card was nice to have for photo and video editing. It's not meant for gaming, but if you set the game's graphics settings to low, you can get playable frame rates with it. For the best performance, I would keep the slow hard drive out of your configuration. Also, if you want a 15.6-inch two-in-one design with more graphics power, you can step up to the Yoga 720, which is available with an Nvidia GeForce 1050 GPU. 

Lenovo rates the battery life at up to 8 hours for the Flex 5, but we did better than that with streaming video. You can binge-watch quite a lot with our configuration, which ran for 10 hours and 23 minutes. 

Lenovo Flex 5 1570

The built-in fingerprint reader gets you instantly signed in. 

Sarah Tew/CNET

Flipping for the big screen

The 15.6-inch Lenovo Flex 5 is a very good alternative to a traditional mainstream laptop. Though it is thin and relatively lightweight, it's maybe just a bit too much to carry around every day. But, the bigger screen does make it a good choice for general home office use or schoolwork, especially if you're going to be using its display full-time. And when it's time to stop working and kick back, the added screen flexibility and the Flex's crisp-sounding stereo speakers are terrific for movies, music and games. 

Cinebench R15 Cinema 4D benchmark (single-core)

Lenovo Flex 5-1570 127Samsung Notebook 9 (15-inch) 127Samsung NoteBook 9 Pro 151Apple MacBook Pro (15-inch, 2017) 160
Note: Longer bars indicate better performance

Cinebench R15 Cinema 4D benchmark (multicore)

Lenovo Flex 5-1570 292Samsung Notebook 9 (15-inch) 320Samsung Notebook 9 Pro 355Apple MacBook Pro (15-inch, 2017) 764
Note: Longer bars indicate better performance

Geekbench 3 (Multi-Core)

Asus VivoBook S 6053Lenovo Flex 5-1570 7384Samsung Notebook 9 (15-inch) 8042LG Gram 15 8083Samsung Notebook 9 Pro 8347Apple MacBook Pro (15-inch, 2017) 15440
Note: Longer bars indicate better performance

Streaming video playback battery drain test

Samsung Notebook 9 (15-inch) 736Apple MacBook Pro (15-inch, 2017) 643Lenovo Flex 5-1570 623LG Gram 15 582Samsung NoteBook 9 Pro 509Asus VivoBook S 427
Note: Longer bars indicate better performance (in minutes)

System configurations

Lenovo Flex 5-1570 Microsoft Windows 10 Home (64-bit); 2.7GHz Intel Core i7-7500U; 8GB DDR4 SDRAM 2,400MHz; 2GB Nvidia GeForce 940MX; 256GB SSD
Samsung Notebook 9 Pro Microsoft Windows 10 Home (64-bit); 2.7GHz Intel Core i7-7500U; 16GB DDR4 SDRAM 2,133MHz; 2GB AMD Radeon 540 Graphics; 256GB SSD
Asus VivoBook S Microsoft Windows 10 Home (64-bit); 2.7GHz Intel Core i7-7500U; 8GB DDR4 SDRAM 2,400MHz; 128MB Intel HD Graphics 620; 128GB SSD + 1TB HDD
Samsung Notebook 9 (15-inch) Microsoft Windows 10 Home (64-bit); 2.7GHz Intel Core i7-7500U; 16GB DDR4 SDRAM 2,133MHz; 2GB Nvidia GeForce 940MX; 256GB SSD
Apple MacBook Pro (15-inch, 2017) Apple MacOS Sierra 10.12.5; 2.9GHz Intel Core i7-7820HQ; 16GB DDR3 SDRAM 2,133MHz; 4GB Radeon Pro 560 / 1,536MB Intel HD Graphics 630; 512GB SSD
LG Gram 15 Microsoft Windows 10 Home (64-bit); 2.7GHz Intel Core i7-7500U; 16GB DDR4 SDRAM 2,133MHz; 128MB dedicated Intel HD Graphics 620; 512GB SSD

Lenovo Flex 5 (15-inch)

Score Breakdown

Design 8Features 8Performance 7Battery 8