Any particular reason for the the rear shifter on the left? or for the grip shift? It could just be personal preferance, but coming from the guy who cut the lil' fender to swap the shock around, I'm expecting an awesome reason.
For my style of riding grip shift works awesome. I like it better than using a trigger. Having it mounted reverse helps with Downhill style shifting, rather than just regular shifting. It makes more sense if you have one in front of you.... But its sweet. They're cheap enough to try one out for yourself too...