Instruct: Classify a given Amazon review as either positive or negative.
Query: Almost All I Expected

Kensington is the best. No doubt about it. I love the feel and touch of this trackball. My only disappointment is that it doesn't have a scroll feature. Apparently, to get that feature, you have to move up to the much more expensive model. The picture is deceiving. I thought it would be much larger and appear more of a gamer's gadget. No. The shape is thoughtfully engineered for the contour of my hand. It is almost effortless to navigate. I suspect that the next trackball I purchase will be the top-of-the-line Kensington trackball. I believe they are worth it.