Hello, The mouse itself is of good quality, by cons can not install the "HP Foam Suite" software provided on the CD to enjoy the 4th center button is the horizontal scroll (on the wheel). Even downloading the driver on the HP site, it does not sinstalle. The trick, though I have Windows 7 64bit, I downloaded the HP driver for Windows XP 64bit is it to operate, at least for me. Try it if you have the same problem.
