I bought this initially as secondary laptop mouse, and I have encountered no issues with performance or ergonomics. It has traveled across the Atlantic and subject to significant amounts of travel abuse, and not a single issue with performance. While it is nothing fancy, it doesn't need to be.
Use this for mostly business but sometimes for casual gaming (Counter-Strike).
Pros: + Price is VERY Affordable for a Logitech Mouse! + Build Quality is Excellent + Long Chord (I use a rubber band to cinch the chord for when I'm using a laptop- works well) + Scroll Wheel isn't obnoxiously loud + Great feedback when I click left/right + Comfortable
Cons: Honestly can't think of any
Side Notes: Lifting the mouse reveals a red glow under the mouse (when plugged into a computer) Mouse is extremely light