FiddlLINK Dexterity Developer
http://www.handhealth.com/FiddlLINK
It took me about an hour to understand why they're as fun as they are. It's not an intuitive movement at first.
I've had it for two days now, and the burning is just letting up. They're quite a workout on those little finger muscles that don't normally get a workout.
I have to admit, I went ahead and bought these to train for the challenge with Matnotah. I'm old and slow.
~Dave
http://encountersthetvshow.biz
http://www.youtube.com/user/theblasto