Price is part of the equation, but not the only thing. If information (help) flows easily, My loyalty is not swayed by $50.00
Now $100.00 and I may look the other direction
That part I can speak to on two fronts. AMS as a vendor was wonderful to work with. Great on the phone before, during and after. I'm a one to two day ground ship from them and both times they got parts packed quickly enough that I had them the next day.
D&D itself also proved to be exemplary in their consumer support. Had a clamping issue with one of the mufflers. Called to ask about clamping alternatives and before even asked for anything they offered a new muffler. Shipped it out immediately with no requirement of prior return of the old one. After mentioning that here a couple others who had a similar clamping issue called the company and got the same level of service. They were excellent to have done business with.