Summary: This is a small sized mouse that is very comfortable to use and has a lot of features. I would rate this as an outstanding product except for the following issues: Poor quality control-several mice (I ordered 10 for a business)did not work out of the package - major issue seemed to be poor fit of battery door keeping mouse from working.
Pros: Accurate Tracking, Comfortable Design, Fast Response, Glides Smoothly, Great Features, Works On Any Surface
Cons: Not for continuous use, Poor Battery Life, Poor Quality Control
Pros: It's small & you clip the dongle into the mouse to save the battery. Has great battery life.
Cons: It's small and a bit hard to hold from an ergo perspective. If you bump the dongle slightly, it'll "hiccup" for about a minute afterwards with intermittent function, until it "calms down". Real short range.