It's gonna take me longer to decided and then pry the wallet open for a new receiver then it did to buy a TV...but you are helping...I think.
I run the VSX-82TXS, I'm not sure but it must be at least a year or 2 older than Adam's VSX-23. I think mine is pushing 6 years old right now.
I really don't see much reason to upgrade. It doesn't do all the HD Audio decoding, but big deal because the PS3 does. It isn't network capable, but big deal because I have a tower PC in my HT. It doesn't do 1080p upconversion (only passthrough), but big deal because I only feed 1080p signals anyway. The only reason I could see to upgrade right now is that it doesn't have HDMI port on the front, a small hassle every now and then. Oh yeah, I would like to be able to set crossovers independently for each channel rather than a universal setting.
The MCACC is great for movies and getting the dialogue dialed in, but for music I run direct or PD. I suspect that I may have an older version of MCACC than Adam, his is probably better.
It did have a steep learning curve, but now that I am very familiar with it, I don't feel like learning a new receiver either.
On the plus-side, it has a phono input, it has pretty beefy amps, I like to be able to dim the display, and I have had 0 issues (other than self-inflicted learning curve) over the 6 years that I have had it.
On the other hand, my Samsung 52" is about 5 years old and I drool over the sharp pictures on the newer technologies. Not that the Sammy is bad, and it was certainly very good when I bought it, it's just that I can see improvements in the technology since then.