OK, I'm biased. I invented the Twanger PraxAx. I did it because I wasn't getting much useful practice out of hitting the steering wheel or plucking the bead of the car seat. And I DID need more practice. The first prototype, after I got used to the idea of playing with only one hand, really worked. I got a lot better in only a few weeks. My time, endurance, touch, speed, accuracy all were noticeably better. Well, enough said. Please check out www.twanger.com to find out more.