Buns
That is cheap!
I haven't used this model but I do use a Philips UGO-S at work, which is axactly the same, and what would say is that it has a noisy fan and that the bulb life is only 1000h. It doesn't have a zoom lense either, but thats no problem really!
Then we come to the DLP Rainbow! I can not see it myself, and maybe you can not either, but when you are showing off your system to your mates, they might!
But, yeah! That's cheap!! Where did you see it and do they have other projector at these kind of prices?
Meat