I just got back from the midnight release showing so yes, I've seen it and there will be spoilers so GO AWAY until you've been!
The first thing we both said after it finished was that it did not feel like a Star Wars movie. Actually no the first thing was "okay wow that was pretty smurfing sweet" but yeah. I guess it comes with the territory of having a different director but the tone, pacing, dialogue, everything was markedly different from the other trilogies. Even the music felt different, even though it was composed by the same guy and some themes were obviously reprised. Obviously there's a lot of parallels and borrowing from A New Hope but it still felt different from that too. Whether or not you think it's a good thing, well, YMMV, but I for one rather enjoyed it.
I love both Rey and Finn, fantastic jobs by the actors and they felt real and believable, as well as characters we could relate to - no boring stoic Jedi. And indeed the villains of the piece were suitably rotten too, no generic robots or guys with funny face tattoos who have like two lines in the whole movie to be found here.
Han picked right up where he left off, like slipping into a comfortable pair of worn shoes. Didn't miss a trick or a beat. This was probably my favourite Chewie movie too. Leia felt a bit off and different but we'll see how we go in future movies.
Without doubt it stomped all over the prequel trilogy and left them in the dirt. Like I said, it was pretty damn good. I don't know how I feel in comparison to the original trilogy yet, I will need time to process it and think about it all but what I do know is that I had a fantastic time.