Does it have negative points? maybe a very high price?

Because the positive are great: 1080p resolution, "eliminating maintenance costs such as lamp replacements and filter changes", "50% increase in color gamut range", "contrast ratio in excess of 500,000:1", "the illumination system has a long life and offers up to 30% lower power usage", "inherently prepared to withstand dusty environments".

I mean, it's a real thing. But price will probably be huge, at least for the start.

Btw, what about lumens? I can assume that it should be fine if contrast is that good, but I'd like to know.

I'm thinking about buying either large LCD TV or projector in next few months, but if these babies are comming by the end of this year, I'll be waiting for sure. Ofcourse, unless prices will be much higher than let's say 42/46" 1080p LCDs... and I'm affraid they will :/ If not - both LCDs and plasma will be dead soon! :P