I have the ML500 and really like it. In a dark room, it projects a 90" screen really well, though it doesn't take a lot of light to degrade the image at that size. I use it with my PS3, roku, PS2 (with an adapter), phone, etc.
One complaint I have is it doesn't have an audio out and its built in speakers aren't amazing. Most devices are easy enough to output audio separately, though.
Here's some info on it, too: