Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Quite nice.

I work as a sales associate at an office supply store. I had a chance to demo this model recently; and all I have to say about it is "Wow". My expectation for comfort was exceeded, thanks to the carefully executed ergonomic design. The optical technology used in this mouse allows for more precise cursor movement. And I just love that I can scroll left & right.