I've recently started beefing up my Concert DVD collection, and I keep on coming across two Guns n' Roses releases, Use Your Illusion I and II. Anybody have them? What is the verdict? How is the audio/picture quality? How does the band sound? Also, on a somewhat unrelated note, I just picked up AC/DC: Live at Donnington for a cool $10 at Walmart. Is the *other* AC/DC concert DVD, Stiff Upper Lip, worth it as well? Or are they essentially the same thing?