I think the comparison has turned out good, both amps perform to manufacturer spec, ratings and then some, and has answered many questions. i remember buying a punch 225a2 10 plus years ago and it had a birthsheet of 800rms what a little beast pushing 2 punch hx2 15's, my point is the amps compared above are indeed are different and performed well, and in any batch of either of the amps one 3500 may do 3500 one the dot and the next could do 3900 etc. having owned and run the aq 3500d i was blown away with it's size to output ratio and its reliability. I have no exp with sundown yet but come october i will, and expect to own another great product. As for AQ I have nothing but great things to say about the product and even better things to say about DJ and his customer service. I look forward to building the same trust in Jacob and his product, as i will be running both.