Shane,
I hope I didn't come out as rude on Twitter — some people who follow me had expressed interest in my recent purchase, so I was just sharing my opinion.
Regarding the PowerMate, I've filled a RMA request with Griffin's return team. There are two areas of trouble with the unit I received:
1. Poor hardware
I found the aluminum finish to be very rough. The top, especially, is not pleasant to interact with.
Moreover, the base has a cheap-ish looking, glossy anti-slip texture that accumulate dirt really quickly. I found myself cleaning it every day with tape in order to remove the specs of dust and make it grippy again.
Finally, the "click system" is poorly executed: it is hard to activate and it gives no satisfactory click.
2. Poor performances
I'd have been okay with the software if it wasn't for the very poor performance. I initially configured the PowerMate as a scrolling device (rotate clockwise to scroll down, counterclockwise to scroll up), but in my experience, it has never been reliable.
Most on the time, a scroll up would start with a scroll down before going in the right direction (same thing when scrolling down). Even when it scrolled in the right direction, I've never achieved the level of precision I wanted. I've toyed long and meticulously with the sensitivity parameter; however, the end results have always been the same.
I've been using it with a late-2013 retina MacBook Pro, which is both listed as compatible on your website and never had any hardware problem (I've happily used Bluetooth keyboards, mice and speakers with it without any issue); therefore, I think I can rule out problems on my behalf.
Thank you for reaching out to me, but I think I'm going to return it anyway.
Have a nice day,
Luca