A few reviewers have mentioned that this isn't the original theatrical version, despite what it says in the tin. It's true. The film on the second disc seems to be the same as the THX digitally remastered version that was released on VHS in, I think, the mid-late 90's.
There don't seem to be many differences between this one and the original 1977 effort - a couple of tiny alterations of the 'blink and you'll miss it' variety, but the sound & picture quality are certainly improved.
Like a lot of people, this is the version I bought the DVD for and after having some misgivings after reading the reviews on here I have to say I am very pleased. It is in widescrren format but I haven't had any problems with that. The picture quality is great, although maybe more VHS than DVD but again I'm not complaining. I've not noticed any grainy images yet - that's not to say they aren't there, but they certainly don't distract from the enjoyment of the film if they are.
Sound quality is very good, too, and the soundtrack (voices, music etc) has obviously benefitted from some cleaning up.
There are no extras included with the 1977 version - it in itself is regarded as a 'bonus feature' but the 1st disc includes some commentaries, including one by Carrie Fisher which could be interesting.
I have to admit, though, that I didn't buy it for that version.
This is the film I remember watching from being little - nothing has been added and nothing has been taken away, or very little! If you want the film as it should be seen, buy this! If you're after bundles of extras, however, you may be disappointed.