Never saw it before. I never had a problem with the stock ones but I guess if you have real small hands (or a small thumb) it might be a worth while investment? In the picture though it looks so far out towards end of bar that it doesn't seem like it would fit anyones hand right but then again it just might be a hot set up? The "gimmick" has got me curious enough to try it!
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Adjusts everyway imaginable.
http://www.factoryteam2racing.com/ipithumb.asp