Before purchasing this set I read through the reviews of previous seasons. I read several that mentioned the poor quality of the dvds for season 2 and 3 and recommended skipping to the 4th season. I did as suggested and am here to report that season 4 has major glitches with quality as well. We have tried to watch 2 of the dvds and have ended up very frustrated when they begin stopping, pausing and skipping around. One episode was totally unwatchable once it began to pause etc...I haven't returned it nor will I purchase any more simply because I don't trust what I will be getting and it sounds like when people return their faulty sets they are merely replaced with another faulty disk set...It also sounds like Universal does not care about the feedback they are getting from customers....