Alright... I've watched through the first half hour of A New Hope (1-4)
TPM: Quality is all over the place. Some scenes look amazing, some look like upconverted dvds. Color was more accurate for the most part, but I literally had to thoroughly calibrate my tv when watching this, just to make sure it wasn't my TV making the quality change. The warm setting pushes Tatooine a little too warm for my liking. Nice to see CGI Yoda.
AotC: Quality is definitely better than TPM, but still varies from scene to scene. Really enjoyed the addition of Shmi's voice in Anakin's nightmare.
RotS: This was friggin stellar, in every aspect. Everything has been blended much better without softening the picture. I used to hate the R2/Buzz droid scene because it looked so out of place. It now looks great. I'm not sure if this was altered slightly, but either way, definitely a step in the right direction. Picture is pristine, Avatar Quality. I will admit... this makes all of Palpatine's weird faces stand out even more during lightsaber battles.
Prequel Trilogy Audio is near orgasmic to my ears. Everything has been mixed in so much better, and sounds amazing on a 6.1/7.1 setup (I've got an older DTS ES receiver, and it still wowed and amazed every second of the film. Lightsaber battles especially)
ANH: So far, this does look pretty amazing considering. You can easily see which scenes were remastered for the different special editions, as quality seems to migrate between three major pieces. Some Tatooine scenes with the droid have odd color, but I think that is simply because other parts of the film have been cleaned up with colors fixed so much that it throws it in contrast. I hate R2's new rocks, mainly because they are only visible from shots in front of him... shots behind him looking out don't appear to include the rocks...
I personally, while not fond of either, prefer this Krayt Dragon Call. It still sounds horrid, but it actually sounds like a sound a human could make...
Other than that, the audio still sounds great, though dated. Everything here is mixed well too... I enjoy the louder surround channels and clear dialogue.
The prequel deleted scenes are very disappointing, often with questionable quality and quirks... The lost Twently is particularly odd... it made me wonder if it is a precaution against fanedits.
I'll post what I think of the rest as soon as I get a chance to watch.