I have seen the MT5 (or LS110) in February and I was a bit disappointed: motion artifacts, noisy, black not very good, a few rainbows and it is too expensive compared to other pj. We used the svideo input. The LS110 needed at least 3 or 4 firmware upgrades to have a decent picture for the price.
In May, I have seen the Plus Piano and it was much better: the motion artifacts are still there but less visible, very quiet, the black are really black, less rainbows and the price is around £2000. The only weakness for some people could be the absence of zoom (but fixed with the Avanti). I bought the Piano after this demo and plugged it with DVI (from HTPC). I also know someone who tested both pjs (Piano and LS110) with DVI, and the Piano was the winner (close one though !).