Just saw it as my first Imax experience.
It was that... hm. I'm conflicted. It has that "good but.." vibe. As a general movie it was good. On most things a lot better paced, acted and looking than all of the prequels.
However, as has been mentioned now, it also basically re-runs a lot of A New Hope with little twists.
But the one major problem I have with it.. is the music. Sure, the blended in pieces from the original trilogy are nice call to emotions and events, but there is not one single stand out piece of recognisable music that is The Force Awakens own. At least the prequels did have that nailed, even if you didn't like the music, you had bits that were distinctly recognisable and tied to each film.