I recently posted in a WTB classified that I was looking for a high output alternator for a 2003 Chevy Trailblazer. I was contacted by Vertex Audio and they told me they had a Mechman 270 available for my truck. They gave me a price and I write back and informed them that at the moment I didn't have that kind of cash, but was very interested. Without knowing anything about the shop or their program, I told them I had an AQ2200d I could trade in and put some cash with. They told me to send it in and they would test it, if it was good, they'd give me cash towards my new alt with it. I sent it in, they checked it, credited my account and I just ordered my new alt. this shop is class, great to deal with and in my option, running a top knotch business. The trade in program is awesome and I highly recommend them! Can't wait to get my new Mechman alt!!!