I would easily go watch again. I think there are probably lots of things to notice that I missed the first time. I might not buy popcorn and soda the second time. I will usually go all out for a good movie, but I did that once already. Generally theaters can have my admittance fee while I sneak a bag of peanuts or M&Ms in my pockets. $5.00+ for .25 worth of popcorn? No thank you. And no, I a big screen TV at home now, so you can't sell me on the "experience" of being at a theater. (Ok, maybe for really good movies...)
What I loved about the movie that maybe others didn't appreciate is that it still happens in the SW universe so there is plenty of the SW feel and references, but they can tell some of the side stories without risk of affecting the main story. I mean, no worse than George Lucas already has with some of the prequels.
The effects are top notch, there was plenty of action, and even the slow parts near the beginning were interesting to me.
I was thrilled to see that guy on the Death Star and then I was like, "Duh! It's the DEATH STAR! Of COURSE he's going to be there!"
My only gripe was seeing that one guy from the cantina on Jeddha, but then after what happens to Jeddha makes me wonder how he made it to EPIV. I bet there is an interesting story behind that!