Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Good Ergonomics, but no Precision

I expected this mouse to be as/or more precise then the optical explorer mouse I had from Microsoft. Once the MS mouse stopped working correctly. I bought this mouse. I have to say it fits my hand perfectly, but has many bugs. It will for instance: not record slight movements in opposite directions correctly, will sometimes just stop working only to start working 5 seconds later.It's so buggy and it's not even funny. Save yourself the money. I installed / reinstalled drives, checked-rechecked, read-reread manuals. It still works like crap. Please buy another mouse then this.