I have and like the Throttle Boss. I like that it isn't so large but is big enough.
http://www.kuryakyn.com/products/262/universal-throttle-boss
http://www.kuryakyn.com/products/262/universal-throttle-boss
Personally I think of a throttle lock to relieve your wrist. Kayoko, breakaway, throttlemister ect.
A throttle rocker hit at the wrong time could lurch your bike forward and into trouble. Not to preach, just my opinion.
I have a Throttle Rocker, not idea about which version. It is a life saver! You are welcome to take a look and/or borrow it the next time we see each other, if you haven't made a decision by that point.