The Good: The MX Master is a rechargeable wireless mouse for Macs and Windows PCs that offers smooth, precise operation, lots of customization options, good ergonomics, and works on almost any surface. You can connect to up to three computers using Logitech's included Unifying Receiver USB dongle or opt for Bluetooth connectivity. Speed-adaptive scroll wheel lets you auto-shift from click-to-click to hyper-fast scrolling and a thumbwheel lets you scroll side-to-side. The Bad: It's somewhat expensive, and the rechargeable battery isn't user-replaceable (but should last several years). The Bottom Line: While somewhat pricey, the Logitech MX Master's expansive feature set and smooth operation make it a worthwhile purchase for power users seeking a high-performance wireless mouse. \tPrecision. Speed. Perfectly sculpted. \tThose are terms you might associate with a high-performance sports car, not a computer mouse. But that's just how Logitech is describing its new flagship MX Master Wireless Mouse, which is descended from an impressive lineage of mice that includes the and . \tSelling for $100, \u00a380 or AU$150, Logitech says it's the company's "best mouse ever." \tI've been playing around with it for a couple of weeks, and I have to say it's pretty darn nice. I've tried out some high-end gaming mice over the years, and this has some of their precision attributes, but it's designed for day-to-day use and -- dare I say it -- actual productivity. \t \tThanks to Logitech Dark\ufb01eld Laser technology, it works on just about any surface -- everything from a glass table to the Formica-style finish of my work desk. \tIn my testing, I didn't do anything too fancy with it, but it does seem very responsive, precise and smooth. From an ergonomic standpoint, it also feels quite comfortable.Lots of customizable buttons \tAs you might expect from a high-end mouse, it does have plenty of extra bells and whistles. The first of these is an integrated rechargeable battery that's supposed to last up to 40 days on a single charge (you can continue using the mouse while charging with a Micro-USB cable). \tYou can connect the MX Master to your Windows or Mac computer with the included Unifying Receiver (a small USB dongle that will also work with Logitech keyboards) or via Bluetooth Smart technology. If you go with Bluetooth, you can pair the mouse with up to three devices and switch between a laptop, desktop or tablet using the appropriately named Logitech Easy-Switch button.Using the Logitech Options software, you can customize all the buttons on the mouse. Mac users, meanwhile, enjoy the extra perquisite of gesture support -- most of the multi-finger trackpad gestures can be duplicated on the MX Master when holding down an extra key.