Let me start off by saying the movie was very entertaining. Definitely worth checking out. But what adds to fun is the whole experience, starting from waiting in long lines to sitting there in the theater waiting for the movie to start.
Ten of us got there about three hours before midnight. The line was already pretty long, but we were better off than the people going to the theater two streets down. Their line was at least three times as long as ours was. :D So anyway, we picked up the tickets we had pre-ordered online, then picked up some food from the nearby Subway, and sat there waiting in line.
It's always amusing to see all the die-hard fans dressed in costumes, walking around wielding lightsabers. We saw a couple of Darth Vaders, and this guy walking around with a huge 17" Powerbook recording the whole thing with his iSight. Hahaha...
Once we were finally in the theater, you could literally sense how restless everyone was - the continuous hum of people talking, lightsabers turning on and off every two minutes, shouting and cheering etc. It was great! :D
So yeah, if you're planning to watch it, do it sometime within the next couple of days. You need to watch this in a theater filled with fans. It's an experience in and of itself. It actually makes waiting in long lines fun. :P