I signed up for ultraviolet and so far not impressed. You have to create a ultraviolet account and then another for every studio you are streaming from. My first movie Hugo will not even work. I was getting all kinds of weird error messages and now its simply the service is not available. The Thing seems to be working and they also gave me a credit for the movie on amazon. When I redeemed the code on amazon a message said the movie may not be available after june. So really why even give a Amazon code?
They have a long way to go. If they give me a free code with a disc that is fine but its nothing more than a extended rental they can shut off anytime and may not work.
Edit: Being able to backup a copy of the movie as a alternative when its no longer available is great but it defeats the purpose of all this cloud stuff. I am somewhat interested in streaming because I don't want to rely on a home media server. Even a large music collection is much easier to back up offline compared to a entire video library of hd movies.