Last night, I bought 'Return of the Jedi'. I felt that Episode VI's edits (Little Shop of Horror's Sarlacc, Sabastian Shaw Replacement, and Ewok Ending) took away from the vintage side of the Star Wars. When it came to the 2004 edits for Episode IV and V, I thought they really added something to the trilogy. I don't agree with all the edits made to Episode IV and V, but they didn't bother me as much.
As for the enhancements and sound, I find the changes weak at best. I think Lucas could have taken the 2004 versions (with the digital sound, matte fixes, color clean up), and just reverted the movies back to the original. Therefore, we got the original versions with fresh colors, modles, etc...
R.I.P. to 'The Source' and 'MacCorp'