Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great keyboard, nasty mouse

I bought this combination to replace a similar corded, Microsoft wireless keyboard and a very old corded Logitech mouse. The keyboard is wonderful. It has buttons for shortcuts and make like easier.Mouse is a different story. I like that it is wireless. The shape, however, is not good for comfort and using for an extended period of time. The mouse is higher that other mouses, but is shorter from the front of the mouse to the back. It forces the hand into a ball. If this mouse was longer it would infinitely more comfortable. Additionally, the mouse forces the hand to be more on the back and side of the hand toward the little finger. Again, if this mouse was longer, I think this would be a great comfort feature.Since I have started using this mouse, my hand is really hurting and I am having problems now going back to the previous mouse.I would have given this a 2.5 but half stars weren't allowed.Again, great keyboard, but the mouse is a pain (literally)!