I've spent some time with the 73" model and I've watched the 82" for maybe an hour .. I also have a FP HT ..
I think that at this size, 92" .. it becomes a viable alternative to FP .. these RP DLP units are quite bright, and have a great PQ in a normal living room environment .. as well as being the only game in town for a set of this type .. I don't see how, at the rumoured price point, you could do any better PQ wise ..
I would also guess Mits knows it's going to be quite some time before affordable LED/LCD displays reach this size .. and there is a market for this size and larger .. in fact, other than room restrictions, I don't know if there is a limit on how large a set like this can be ..
It comes with the same set of issues any DLP comes with .. possible rainbows if you are sensitive .. lamp replacement as needed ..
I think my point is that PJ's, even in this down economy, have been a fairly strong seller .. however, many are reluctant to place a unit on the ceiling, deal with a screen, be ready to live in a bit darker environment especially during the day if you have windows, etc ..
This line of large DLP's helps fill a void and obviously is a money maker for Mits, otherwise they would not continue and expand the line .. I'm all for it ..
Although there are those that would say 92" is too small when comparing to a FP setup, I disagree .. there are many HT's with screens between 64 and 92" .. take a look at the offerings from many screen makers such as Carada .. they would not manufacture these sizes if folks were not buying them .. I run a 110" screen .. a 92" DLP, if I had a smaller room, would be a serious contender for me ..
Lastly, these sets, when properly calibrated/adjusted, are quite spectacular .. in a normal living room environment ..