I just watched episode IV of this 'old' version. I was disappointed. it was NOT the version I saw in the theatre when I was a kid. several things were enhanced and there was even CGI added! I felt scammed for buying this. I can give some specific scenes:
* luke racing back home to save his aunt/uncle - the 'hovercar' (forgot the name of it) had computer touchup underneith to make it look more like it was hovering and less like it was frame-by-frame hand edited.
* right after bar scene - jabba was CGI - rediculous. they had no such animation in '78.
* same thing with the elephant looking things hanging around outside the bar.
* the engine of the falcon were enhanced in some scenes...some were not.
* short added scenes of desert CGI creatures - rediculous - not in '78.
and so on...
 man, do I feel like a dummy...the kids noticed the 'Bonus Disc' was the one with the original version. lol
I checked some key parts and sure enough...just how I remembered it. (I saw it about 10 times in '78).
I already got a roasting from the kids...so go easy.