Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Downsides...

Using the computer all day, I am very picky, so this review may not be for everyone. The wireless portion seems to work well - only a slight lag. The mouse is very heavy, and after moving it around constantly you being to feel it in a an hour or so. Lastly, who doesn't snack while they work. The matte black finish on the mouse stains immediately - potato chips being the worse culprit.