The one I was using (fmovies) seems to have shut down, and all the ones that I have tried since seem to be down half the time. They'll go down right in the middle of my movie, and then won't be back up for at least another day. It takes me like 3 days to watch a movie.
Yeah it's great I use it all the time - my partner and I just watched Mulholland Drive on it last night. Only trick is to know how to find the good stuff, cause there's tons of garbage to sift through