I had an issue with a chipped control ball, which renders the trackball useless. It took some correspondence, but eventually they decided to send me a replacement, free of charge. It has been 6 weeks and the control ball has not arrived. I think I was lied to again.I have used one of these for years, and was very satisfied with the performance. However, with no support, and their decision to weasel out of the warranty, I would not recommend any Kensington products to anyone.