I have all of the seasons from 1-19. I don't have 20 for the simple reason that I can't find it. They are all on normal DVD. I also have the movie on DVD and UMD (for the PlayStation Portable). All DVD's worked fine, but the design packaging, not so much. Season 1 is missing it's manual and back cover (you know, the piece of paper telling you about the episodes). Season 10 never came with the back cover, because I brought it from a second hand store. Season 13's packaging is now a flat piece of cardboard, and 15's is non existant. Season 11 is complete, but with a badly damaged cover. I am missing disc 2 of Season 16, but it contains the weaker episodes of the season. Also, the Simpsons Movie UMD is in a Simpsons Game case (second hand store messed up, giving me the movie instead of the game). I'll stop now.