I have been an avid Star Wars fan from when I was a kid and when I found out it was coming out on Blu-ray I had to get it.
Of course George Lucas in his infinite wisdom has altered some more scenes in the 6 movie set. Some like Ep 1 where they replaced the horrible puppet with a fully CGI one was definitely a good edit. Most of the other changes go unnoticed like the Ewoks blinking.
However Vader shouting no when hes throwing the Emperor to his doom ruins the drama at the end of ROTJ, and is almost laughable.
If you can look past that edit all others are minor and the films haven't changed from the DVD release. I have to say the sound is absolutely awesome, you need to hear it on 5.1 or above. Ships zoom from behind, lazer blasts travel across the room, the sound is truly epic. All movies look fantastic too on Blu-ray with maybe the exception of A new hope which looks grainy at time but this is probably due to its age and doesn't detract too much.
Probably the best feature of this 6 Blu-ray set is the special features. There is tons of it and its worth getting just to watch the bonus features.
I would have given it an excellent score but unfortunately Lucas changed a little too much again, shame he could not release the original unedited original trilogy. Oh well.