Nice knob. Bad software. Usually does not start when OS boots. If it does, it won't last long. You have to CONSTANTLY reinstall the driver to make it work for a while. Yes, Griffin is a "Mac" company and yes, PCs suck and all - yada-yada... None of the other USB devices I have fail like the Powermate does though. Hey, Griffin, hire someone who knows how to make the damned thing work, OK? Tech support is NO help. This product has been out long enough for this problem to have been resolved. They obviously aren't concerned.