Instruct: Classify a given review as either positive or negative.
Query: Not worth the trouble....

I purchased this mouse as a replacement for a ball type mouse that had just plain worn out. The worn out one performed better than the new basic optical mouse! It's true: The pointer randomly jumps all over the screen. I tried it on my desktop and on a mousepad...no difference. I lowered the speed even to the lowest level...no difference.Having a pointer jump around is annoying enough while playing games, but it is downright dismal when working on important business spreadsheets.There is no support for the basic optical mouse at Microsoft. I'm not one of those compulsive Microsoft bashers, but they are taking the money and running with this product.Forget this piece of junk. Also forget the milktoast "It's still a good buy for the price" reviews. If it doesn't work reliably, it's a bad buy at any price.