I went to watch this last night. I thought it was good. I won't put any spoilers in incase people want to see it.
One gripe though, the film spans at least 18 years, yet Jake Gyllenhall doesn't age a day. Thats a bit annoying.
All in all, 8/10.
Another thing, how fucking expensive is the cinema? I had to pay £9.10 for my ticket!!! Outrageous.