I can't speak to the HK 635, but recently picked up a HK 630 and absolutely love it. Lots of power, individual channel bass management, HK's Logic 7 decoding all add up to it being ideal for my system. The delay issue is a little annoying, but certainly not a big deal (IMO). The HK rep I dealt with when buying my unit (I got it on the HK Ebay auction site) assured me that they will have a software update that will solve the issue soon. I should note that they've been saying that for a while. If you want to save some money check out the Ebay site for a 630 if you haven't set your mind on a 635. Service was excellent and I saved a bundle. Good luck with your choice, I don't think you can go wrong with either Denon or HK.
M22's
VP150
QS4's
HK 630
