Can't speak for the longevity of this item, as I have only owned it a short time. However it tracks great and doesn't appear like it will run into issues like some of my other mice. Since the cable is not braided, it cannot fray, yet the finish is unlike traditional wires, it still seems high quality: thick, yet flexible. The mouse is driverless, so no twiddling with drivers. Lastly there is no thumbrest held on with goop that will eventually fall off.
In term of performance it tracks incredibly smooth. The shape is comfortable for those with smaller hands. If you consider yourself to have large hands, opt for the EC1 eVo. Overall seems well worth the price.
Update:
I have gotten used to the mouse 4+5 placement and no longer see it as a con. But I have noticed if i put the mouse under intense light I can see the remnants of where my fingers reside on the left and right click buttons. Docked .5 stars. Now 4/5.
Update 2:
Small amount of optical light bleeds through the scroll wheel
Scroll wheel lighting is not 100% uniform
Docked another .5 stars 3.5/5
Still one of my favorite mice.
