Summary: This receiver has been very disappointing. The software is flaky and laggy. The surround modes cannot be used to "enhance" stereo because they shift stereo sources to the left. After just a year, the tuner no longer works. Stations have to be tuned manually, and only a few of the many stations in the area can be captured successfully. I thought Denon was supposed to be a very good brand. I would never buy any of their products in the future.
Pros: There is nothing special about this receiver.
Cons: Lots of things have never worked properly. I can't believe this is a "high-end" receiver.
Summary: This supposed to be Onkyos compitition? PLEASE.No THX cirtification? And weighs less than HALF of the Onkyo TX-NR5010!!! I got a smoking deal on the Onkyo TX-NR5009 for $1, 997 on Amazon. Really do yourself a favor and buy the ONKYO. It a beautifully made peice of equipment. Its fully THX certified. The unit itself is so beautifully made that you will hesitate hooking it up for a couple of days just to look at its gorgeous huge transformers. Trust me.
Summary: Upgraded to this Denon becasue I have been waiting years for a zone 2 HDMI option. The 4520 has a "zone 4" pass through... Why? The lower end Denon's have a Zone 2 HDMI independent signal. Had to go down to a lower end Denon and purchase an additional amp to power additional zones as the 4520 has 11 channels. Other then that this receiver is a monster.