I have been keeping a close eye on this service and I'm pretty impressed. I've been somewhat dissapointed with Netflix's Instant additions of late and have been looking for a replacement. Unfortunately I won't be able to get this until support is added for my Sony Blu-ray player or my Roku box, as I don't always keep up on my Xbox Gold subscription and I doubt it will work with Silver.
Those movies are already available on amazon prime instant video and netflix. You really aren't getting anything with this that you can't already get with netflix. It's the same instant online content you get with all 3 services. Most of which overlap.