So I bought mine yesterday and things ran late but I had to set it up at least a little since I also had gotten two new JBL 810's for my surround sides.
Right now I have the following:
L/R - JBL Ti6K
Center - JBL LC2
Side Surrounds - JBL L810
Back Surrounds - JBL L820
Subwoofers - (2) Sonance In Wall Cinema THX Subs driven via Sonamp 2120
External Amp - Adcom GFA 5006 which can act as a 3,4,5, or 6 channels depending on how you bridge it.
Last night I set up the Adcom to drive the front L/R and centers bridged at 175 X 3. However, it looks like the Adcom is rated at 8ohms in bridged mode and the Ti6k's are 6ohms. So today I am going to have the Adcom drive the surrounds and the center and the onkyo handle only the Ti6Ks.
If it sounds good, it may save me from having to buy a beefier amp to drive those things.
Despite the less than ideal amp setup, I continued with the XT32 and wanted to hear what this thing can do. After two firmware updates, time was getting tight so I quickly did the calibration. I have to say the sound was very very good with one huge exception. I could barely hear my subs even though they were part of the calibration. I know I am suppossed to change the speakers from full range (I noticed XT32 set them to full range) and there are a bunch of other things I need to look into but it was already past 1am. I didn't want to spend too much time on it because I have to change the amplifiers around today anyway. Now I need to re-read this and the XT32 thread to figure out the nuances of the subwoofer. I remember reading something a little while back with similar issues. Got to search for it again.
Anyway, so far so good on the 818 although I kind of swore off onkyo after my 809 required 2 replacements and I sent it back to Amazon for credit in lieu of a third.
So I hope this one is a keeper. Seems great so far.