Well crafted desktop mouse
Logitech really nailed everything with this mouse. Quality craftsmanship, satisfying crisp clicks all around, very good wheel (something often overlooked). Comfortable to hold and nice choice of materials. For desktop use, this is pretty much one of the best out there.
Very well built - sublime clicks, excellent wheel (consistent sound and feel both up and down); Nice middle click with moderate force; All round very sturdy and quality construction; Quality plastic/materials; Feels comfortable to the touch and doesn't show marks/stains from skin oils.
Arch is higher than most mice; so might be a comfort issue for some people (hasn't bothered me though)