Instruct: Classify the given review into positive or negative sentiment.
Query: Begins well... but later on... ehhh...

Well, here's the thing. I liked this mouse when I first got it. After all, its optical, it feels nice on my hand, and controls well.But later on down the road...The track ball has gotten stuck. Don't know how, don't know why, but when scrolling, it gets to a point and STICKS. This is extremely frustrating when playing online video games where speed is essential.This, in itself, wouldn't be much of a problem if there was a way to open it and clean it. But... there's none. No screws, nothing that pops off... its just one solid unit.So, if you're looking for a temporary mouse, then this might be for you. But if you want one that will last more than 3 months... look elsewhere.