Finally got to test it:

7.1 in TrueHD - everything works, plenty of LFE (my FBD is showing plenty of signal and my IB is definitely rocking). Interesting notes - DD+ via Toslink and 5.1 analog is much louder at a given volume, so when going TruHD, I have to turn up the master volume. Overall it's fine, just an interesting note. I wonder if maybe there's something going on with the XA2 and it's anility to decode TrueHD??