Logitech M505 Wireless Ambidextrous  (USB, Light Silver)

I have used this mouse for over 2years and it was excellent (only recently had to replace because my baby girl broke it)

Comfort 4/5
It feels very comfortable in hand and has a nice weight to it. Some people might think it's a bit heavy, but I prefer a weighty, solid device. However, the rubber on the sides doesn't add any grip and seems only cosmetic.

Battery life 5/5
Even though they didn't last the promised 3yrs, the first set of batteries lasted me nearly two whole years on daily usage,...

I've had this mouse for a few months now and the buttons are already going bad. Clicks turn into double clicks and at other times clicks don't register at all. Contacted Logitech and complained, haven't heard back. I use the mouse for browsing at home, no games. Another problem is that the Laser tracking does not work well if the surface has minor imperfections. Works brilliantly on the dinner table, but that's not where I use the PC.

Pros
-Looks good
-Long range, never had a problem
-Great battery life (working for more than 10 months now)
-Great tracking (Had a few problems initially, turned out to be dirt stuck under the laser, no problems after cleaning)
-Tiny unifying receiver!, saves a USB port as I have a compatible keyboard
-Programmable, using Logitech set Point
-Pretty good surface compatibility (for a laser mouse)
-Would work for left handed people as well

Cons
-A bit small(no pinky rest), heavy (because of 2 b...