Received my 920 yesterday from BigBuyCity on eBay. Was well packaged and placed in a separate, bigger box and arrived in perfect condition. Unfortunately I only had a couple hours of free time last night so all I was able to accomplish was unhooking my old receiver, wiring up the new one, running the auto calibration, and then flipping through the menus quickly to see all the options. I didn't even have time to test out a blu-ray.
Thanks to now having a receiver with HDMI and upconverting, I was able to eliminate 3 optical and 2 component cables from my setup. It may not sound like much but when you consider how much room component cables can take up, it makes a huge difference. Plus I can't even explain how nice it is to only have to run a single cable between my receiver and TV. Not only does it look nicer, but now I never have to switch the input source on my TV.
The auto calibration worked well. It was spot on with all of the distances and sizes of the speakers.
Like has been pointed out, when you turn the GUI on it turns off video and audio which is kind of annoying. It would have been nice if the audio still played so that you could hear in real time the adjustments you're making. It's really not that big of deal though because you can access all of the GUI menu items by going to the menu through the receiver's display instead of the on-screen GUI which doesn't turn anything off. As for the looks of the GUI, it's nothing special, but still looks clean and crisp and is a welcome addition.
Unfortunately that's about all I was able to play around with, but from the little bit of TV I watched (Home Run Derby in HD) it sounded very sharp and clear and the auto-calibration worked really well. From what I could tell none of the speakers were overpowering any of the others and all the speakers blended in very well to form a nice surround sound environment.
I'll have much more to post after I get to play around with some LPCM, DTS-HD, and Dolby TrueHD blu-ray soundtracks tonight.