Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Tonka Toy Junk

I bought this mouse after reading rave reviews. I have had surgery for Carpal Tunnel syndrome on both of my hands and was looking for a trackball that was smooth and prevent hand and wrist fatigue. I was willing to spend some money and excited at the prospect of this mouse. When I received it, right out of the box it felt light and cheap. Once I hooked it up the wireless aspect worked fine but the ball was not smooth at all. My hand was really fatigued after 5 minutes. I immediately boxed it up and sent it back. Note, if you are returning an item to Amazon because you don't like it, they are going to charge you for the shipping. Anyway, I am glad to be rid of that junk. The Kensington Trackball Model #64327 is by far the smoothest trackball I have ever used. My only complaint is its lack of a scroll wheel button.