I purchased the 3800 1 week ago. I replaced an Inegra 9.1 because I wanted HDMI switching and version 1.3a with the latest surround format decoding. I looked at the following:
Denon 3808CI- concerns about amp power
Denon 4308CI - high price versus features
Onkyo 805/875 - concerns about heat
Pioneer vsx-92/94 - reported lip synch issues
I am very happy with the Yamaha so far. Some highlights:
Sound - the receiver sounds very nice with both music and movies. It does not seem to have the power reserves of my old 9.1, but it plays plenty loud. DD and DTS bitstream from my Panasonic DMP-BD10A HDMI sounds better then the same over coax digital or analog outs. My Panny does not support 1.3a, so I was not able to test the issue reported by others when chapter skipping DTS-MA and TrueHD movies. I bi-amped my front speakers using the back surround channels. I did not notice much of a difference, but this option is nice to have.
Video - HDMI pass through from my Denon and Panny show no signs of degradation as compared with the direct inputs. I was originally concerned about the qualit of video upconversion for this unit as compared with other. I finally decided upconversion is not too important to me. My Panny, Denon and TV all do a nice job of upconverting. This may be more important to others with different equipment. I did not notice any lip synch issues.
GUI - simple is better and Yamaha has kept this simple. The menu is easy to navigate and make changes. One note, the GUI does not work to well if you are playing content. The receiver seems to have trouble overriding the existing content unless you pause it - lots of clicking and flashing. This is a very minor issue.
YPAO - Very simple to use and worked very well. For some reason, the system was confused by the placement of my sub and got the distance wrong. My room is not the best setup, so I was anxious to see how the equalization works. Subjectively, dialog is much easier to understand after running the YPAO then with my 9.1. I ran YPAO and then manually twaeked the speaker distances and levels (with the my SP meter).
Internt Connectivity - I connected my DSL and accessed Internet radio. The speed of the menus is a lot like waiting for a web page to load over a dial up connection. If you will use this feature only occassionally, it works fairly well and the sounds is quite good. No drop outs noticed during my testing.
Overall, a great receiver for this price range.