My quick review thus far...I still love the look of the unit. There are no buttons (other than power) on the 4520, and I just think that gives it a great and classy look. Coming from MCACC, I am new to Audyssey and am still playing around with adjustments. The GUI is excellent, I hardly miss my old Pioneer "mainframe" style menu.
Heat feels super warm even with preouts used on all 9 channels, though this was before finding the preamp section. Less than 5 minutes after discovering the amp assignment menu and switching the power to external, the 4520 was almost cool to the touch. With that said, I can definitely see why so much ventilation is needed when not using external amplification.
I wound up turning off the scaler for my oppo to just pass he signal. Does anyone like what the scaler can do? I left it on for my Wii input and will test if anything is added to the Oppo quality. When activated, I'm not sure if I like what the Denon does with the Oppo signal.
Audio to me is superior than the Oppo 95 multichannel analog. Granted I am a purely a movie person and do very little music playback. Bass management with Audyssey blows away what the Oppo can do with basic trim and crossover settings. I haven't tried Audyssey with LPF yet, and probably won't since I don't have any neighbors to disturb. I still have a lot of learning to do, I will eventually setup my oppo 103 for multichannel music to demo. But I can see why 95/105 owners consistently use hdmi for movies and analog for music. The only music I played on here was on the HD radio and streaming. The separation these burr brown DACs provide on the denon is definitely superior to what my old pioneer had (pioneer typically uses Wolfson). Everything so far has sounded smooth, extremely smooth. The 4520 is no slouch at all.
If I were to complain about anything, it would be the remote. It just feels cheap and looks cheaper than my budget LED TV remote. The 4311 came with 2 nice remotes and the 5803 had a super cool touch screen remote. Luckily I have a Harmony for control, but it would still be nice to see something a tad better. I also posted a pic of the remote that I received, it appears to be damaged (see the LCD screen leak).
Everything else seems to work great. Keeping my fingers crossed all goes well. I am one happy owner for sure.