I've had a PowerMate for a quite a few months now, I got it free for calling in to the interent radio show "YourMacLife.com".
I'm not sure if I would have bought it otherwise, but it quite a cool little toy. Most people that visit "Mac-O-topia" (my basement) think it is very Mac-like.
I had some problems with it a couple of weeks ago. Jaguar has been *very* stable for me for months now, but after the last time I upgraded the PowerMate driver, it crashed twice within half an hour. I unplugged the PowerMate and later looked for a new driver.
Griffin had rolled back the driver to 1.51, the driver that I was running prior to upgrading. So now that I've re-installed the older driver, everything is fine...