I installed the Bolton suspension fork/front end on my Rad Runner over the summer, and it made a world of difference in ride comfort. Recently, I noticed that it would not hold air, and the shock would deflate quickly, making the bike un-rideable. I emailed Bolton, and got an IMMEDIATE response from Kyle, offering a possible solution to try, and an offer to provide an exchange/replacement. I am super impressed not only with the response, but the no questions asked exchange offer. I have other upgrade parts from Bolton (many), and I am comforted that they stand behind their products. I would certainly recommend Bolton for aftermarket parts, and my bike is SO MUCH more fun to ride with those I have added!
I agree Kyle is a cool guy and very helpful. I just bought a motor from him for testing purposes, and he installed the freewheel to make it easier for me.