Summary: A few things people should know about this receiver before they purchase it as I was sold on features I was told this unit had, shame on me for not doing more of my own research. Although you have 6 HDMI inputs, only 5 are worth using as AUX2 has restrictions. ZONE 2 does not have HDMI output you must use analog component connections (so forget 1080P), ZONE 3 is only for audio.
Pros: This is a powerful beast of a receiver and it will knock your socks off with rich clean sound. 4K capable which is good for the future. The best receiver for 9.2 application hands down. Ok (at best) receiver for 7.2 + alternate viewing zone applications. Manufactured & assembled in Japan, not China like the rest of their receivers.
Cons: Beware of limitations if you have plans to utilize ZONE 2 & 4 with a HDMI fed TV and driven speakers. You will need a good solid universal remote if you want to simplify use and its mandatory if you have other zones. HDMI pass through only in main zone. Cannot run separate Audyssey setup for ZONE 2 or 4. Setup Menu cannot display in another zone (only via internet IP connection & laptop). Has HDMI handshake issues from time to time.
Summary: I am very disappointed with this receiver. As far as I can tell, basically all the salient features on this unit are available on much lower priced models. Here's what I wanted from this receiver: Ability to send same, or differnet signals from theater room to remote location (audio and video). This unit features 4 HDMI output slots, but it is REALLY difficult to do this.
Summary: I got the Denon AVR-4520CI at Christmas after doing MONTHS of research. It worked as expected for almost a month. I had to reset the processor one time, but no big deal. However, not 30 days into ownership and it decided not to play audio from components or within itself (AM,FM,network). Called Denon and they were quick with a service tech to listen to my issue. We spent 40 minutes on phone trying to see if the problem was external to the unit. It wasnt.