This review is purely for those worried about the possibility of dvd's being corrupt, or not playing well.
I too have found this problem, but only in the first three seasons. There were a few episodes in each of those seasons where the DVD stuttered. This was all towards the end of each episode, never in the middle or beginning. So while it was less than desirable, it certainly was not as bad as it's been described on here. For the price, I'm still happy with this collection.
I still don't think it's acceptable to release a faulty product, so I won't be buying any other of these star trek collections. But I can't be bothered returning this item, and get one that's possibly worse.
Summarized; buy at your own risk.