The mouse works via plug-and-play as soon as you insert the USB dongle but -- on Windows PCs, Macs and Chromebooks --you can also install Logitech's SetPoint software to re-map the buttons to commonly used tasks like opening applications, navigating media or engaging shortcuts like full screen video. (The M705 will also work with Chromebooks, sans the custom software.)
One feature that stands out on the M705 is its speed-adaptive scroll wheel that lets users toggle between smooth and notched scrolling using the button on top. I generally prefer to have a notched wheel that navigates down a page click-by-click, but the ability to switch to a free-scrolling wheel is perfect for jumping back to the top of a long page with a flick of a finger.
Logitech innovates further with its in-house USB adapter called the Unifying Receiver. It's a fraction of the size of a typical flash drive and can pair up to six Logitech accessories -- say, keyboards and trackpads -- on the same receiver. The battery compartment underneath has a little spot to hold the dongle too, in case you ever want to travel with it.
I wasn't able to test this claim, but Logitech reports two AA batteries have enough juice to power the M705 for up to three years. It could potentially last even longer if you switch the power slider "off" when you're done with it, and you can actually remove one of the batteries to save a little weight and it'll still work.
The M705 uses Logitech's traditional laser technology and I was able to use it without issue on most surfaces including skin and clothing. The only thing that gave it trouble was marble and glass countertops.
That probably won't be an issue for most users, but it's worth noting that Logitech's pricier models have a different laser sensor called "Darkfield" that can track on those irregular platforms.
Ultimately, you can spend up for Logitech's MX Master and MX Anywhere 2, which offer a more luxurious design and rechargeable batteries, or you can get two Logitech M510s for the price of the single Marathon M705 reviewed here. But this model can be considered the Goldilocks in Logitech's line, delivering superior comfort at a just-right price.