thanks for the replies. the prob with the vortex rearsets is the throw at the end of this shifter is so long you need to have length of the air ram just right so it doesnt bottom out in the when you up shift or down shift by foot if your going to use the frame bolt mount.
But if you use the gatlin or lees performance setup that is no longer a problem. They look like a really nice design, I dont know why you dont see people using them more often.