Well, it only took a single day for someone on my campus to get the dvd rips onto the school filesharing hub, so even though my dvds are still in the mail I've already seen the new versions.
The work Lucas did to bring the video and sound quality of the movies up to dvd standard is excellent, and the change in quality from the SE to the dvds is quite noticeable. It was sort of like watching them for the first time all over again with the changes, of course I was watching them on my comp so I had surround sound for the first time too, but....
After watching the movies, really the only changes I now am opposed to are still Hayden in ROTJ, that was just horrible to watch, Fett's voice is acceptable and I'm still not sure how I feel about the dialogue change in ESB. The whole Jar Jar thing I am not sure about, a Gungan does yell wesa free in Naboo but that's a ya, whatever, type of thing. Overall with the special features coming on the disks, I'd say i that I'm going to get money's worth out of the dvds. Now if only there were a way to zap Guinness back into ROTJ.....