I too saw this pj at the Manchester show as was very impressed (nearly as good as my Sharp xv-z200
).
It was very good and in fact was thinking of buying one until I stumbled across the sharp.
The pic was superb on the H72 and only saw rainbows when I looked for them - it was the best pj I had seen for the money.
I bought the Sharp after reading the comments in the thread on this forum and have to say that the pics are very similar - same brightness, contrast, colours a, excellent blacks and depth of pic. I have watched the same Dancing with Wolves scene on the sharp as was demoed on the H72 and theres not a lot in it.(Pleasantly surprised).
The H72's extra resolution may bring improvements when going high def and I highly recommend it and it is also quiter than the sharp.
However it may be worth considering the sharp for only £580, it comes very, very, very close in picture terms but I dont think you will regret buying a H72 either.
Andy