My bad, he's got the AVR 645. Like you, he swears by it and the unit never gets the chance to cool off. I've compared it to my Denon 1906 and the HK beats it with features and stage depth but it terms of amp quality and performance there isn't much difference... imo. I think that's good news for both pieces. I've been an HK rooter for years dating back to the 70's. I bought the Denon based on great reviews and the deliverd price was too hard to beat.