This is what I went thru, I just bought a bowtech gaurdian and put a ultra rest on it.I had all kinds of problems with my fletching hitting it.
Then I bought a whammy,it was pretty good but still had contact sometimes and my groups werent that good.It seemed to have alot of play in the shaft and had oil seeping from it.the only reason I bought it was it was on the shelf localy- they hadnt even heard of limbdriver!
So I ordered the limbdriver set it up with the laser and after three shots to sight it in I shot a one inch group at twenty yards.I would just get the limbdriver and save all the work of trying other rests.the only thing that is an issue withe me is the arrow holder didnt work on the gaurdian.