But the DS9 cases started splitting on me as soon as I took the shrink wrap off them. Even back in he early 2000's I could see that paramount's quality control for Seaon sets went way down. Paramount kind of set the bar for TV shows on DVD, but then under performed for the remaining Trek releases (except the Animated Series, but CBS was handling that release).
I hear this all the time. But I've had those sets for years and never had an issue with the cases splitting.
I never had this problem, either. Only my season six broke, and that's because I dropped it on a tile floor and the whole thing exploded. It was kind of awesome, except that I was worried the discs were ruined. They weren't. So... it was kind of awesome.