Damn just got back from it. Very intense all the way around. The effects especially the beginning battle scene were amazing.
I think the explanation of the Emperor's transformation, the transformation of the Republic to the Galactic Empire, and Darth Vader's final completion were stunning and very well done.
The ending montage had a great effect and gave me a sense of completion, knowing that I had seen the first 3 movies and now the ending of the prequel trilogy. I will certainly appreciate the first 3 even more now. I can imagine the feelings of those who lived through the days of the first 3 movies and now are able to see a saga completed.
P.S. The emperor, Vader, and Tarkin on the bridge watching construction of the Death Star was the most surreal thing I've seen on film in a while.