Someone managed to get hold of two different copys of Sith on DVD for me. One has the timecode at the top, the other doesn't. Both have pretty good sound and picture, both play fine on my DVD player. I've watched the film at least 5 or 6 six times since it was given to me.
I watched the film twice in the cinema, and will be going again.
I'll buy the official DVD when it comes out in November.
Does this make me a bad person.... No.
Have I paid enough to Lucas to warrant me having the bootleg DVDs...Yes.
If the picture and sound were so bad that I could'nt see or hear anything I would have given them back. But for now, as a stop gap untill the official DVDs are out, they will do fine.

I don't see the harm.