My buddy just had Shain install his turbo kit, a drop and roll, 3" 174 cammo extreme, K-mod rear suspension and a few other things. 2011 Pro RMK. I have never personally bought anything from Shain "yet", but would not hesitate to do business with him in the future. I have had troubles with my stuff in the past [non twisted turbo stuff]and Shain has answered all of my calls and did the best he could I felt over the phone.
Shain also let my buddy ride his personal sled [2011 pro rmk] before he bought the kit. That was all it took. Shain met a couple of other customers at the hill to help them tune their sled. My buddy said Shain showed the guy what to do so he could do it himself in the future if he needed to. The customer had his sled up and running "unbelieveable" according to my buddy, in just a few minutes.
In my opinion I don't know what else a guy could do to prove he is comitted to his customers and product.