Summary: Definitely not your average mouse. Works well with Windows 8, although it took some experimenting to find finger motions that worked consistently. After a while, it felt completely natural and I stopped thinking about it.
Pros: Convenient, lightweight, and reliable. Has an on-off switch to conserve batteries.
Summary: I thought these were pretty cool looking when the came out last year, but the price was kind of high. Picked it up on sale for $25, it's pretty good. Nice and light, cordless, comfortable and a good set of touch gestures. The software is easy to use too. The software gives a decent amount of customization, I do wish I could swap the direction I swipe my finger in to scroll up and down (invert it I guess).
Pros: Light, responsive, comfortable, has touch, software is easy to use.Good price at $25-$35.
Cons: Non sale/MSRP price is way too high at $70. You can just get an Apple Magic mouse at that price that uses more premium Glass/Aluminum materials.
Summary: I purchased this mouse on sale (over 50% off), so the price was right from the beginning. I originally stayed away from the mouse because of the negative reviews, however, so far the product works exactly as advertised. It is very responsive to the input of the various commands - when I use them properly. Part of using the 'more advanced' features of a product like this involve reading the instructions and/or instructional videos.
Summary: I use an Apple Magic Mouse at work on an iMac and have loved it from day one. When I was looking to upgrade two computers at home to Windows 8 I wanted something similar. Seeing the Magic Mouse didn't work as well on Windows I searched for alternatives. It came down to the Microsoft Touch Mouse and the Logitech Touch Mouse T620. After much research I went with the latter.
Summary: Pros: Does everything advertised and the shortcuts are nice in Windows 8, Specially the start screen, desktop, and charms gestures. They also allow you to customize the gestures a bit if you don't like the default ones. Also if you scroll with a fast flick it works like free scroll on my G500 which is nice. Cons: Take a bit to get used to and shortcuts can be a little touchy. For instance, it only has one button to click and the touch surface senses which side it is on.
Summary: I just got this mouse after I returned the T650. The T620 is a much better purchase. I am not a big fan of the flatness of it but I digress. A few things that bug me is that after a while your fingers start to get sticky and the right swipe for the charms becomes near impossible to use. A change that I would like to see would be two finger scroll up to access desktop and two finger scroll down for metro (or vise versa).