Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ergonomic experts don't know ergonomics!

This is an expensive mouse for so little benefit. The product descripton says it was "designed by ergonomic experts for your comfort." Well, it is not for my comfort . . . nor for anyone. I was attracted by the extras - the extra buttons, the horizontal scroll, etc. But, within only a short period of time, the extras proved to be unworth the discomfort. The top buttons are so soft that I cannot rest my hand without clicking one or both by accident. There is a noticable strain from holding my hand awkwardly just to grasp the mouse. The scroll button is also too soft. There is no tactile feel at all. I will be purchasing a new optical mouse somewhere . . . but not from Microsoft. This is not what I paid for. A cheaper mouse may well have been much better.