I have had my 40gb unit for a about a month now, here is what I think of it so far:
BR playback is excellent both PQ and AQ displaying onto a 96" screen with a lowly Sanyo Z5 PJ
Upconversion is excellent, as good or better than my Oppo971 and A2.
Load times are super fast.
Fantastic CD playback.
Very quiet indeed.
Great for streaming photos onto the big screen for slideshows as well as music and video.
If we get DTS MA support it will just be icing on the cake, having said that, films such as Hairspray, Live free or Die hard, Shoot'em up and such sound absolutely awesome and thats just with the 1.5 mbs core.
Overall, top marks and I am not a Sony fan, in fact its the only Sony gear I own, heck even Secrets of HT have it on their best of list for 2007..and thats saying something.