Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: No acceleration and jerky movement

I just replaced this Kensington optical wheel mouse with a Logitech dual optical mouse. The Kensington mouse did not have a smooth movement. Also, the "acceleration" feature did not function. The factory customer service rep said this is standard for Kensington mice, because the acceleration feature is for a trackball. The logitech dual optical mouse is such an improvement! The dual optical sensors make it really precise, with a smooth movement! Logitech has the best acceleration function that I have found in a mouse. Also, the mouse glides on the mouse pad, whereas the Kensington mouse seemed to stick, then slip, repeatedly. Summary: buy the Logitech dual optical mouse.