I have them all on DVD but it's still a pleasure to watch them 'live' for some reason.
The thing that pisses me off about the DVD sets is the lack of 'Next time on Staaaaaaaaaar Trek: The Next Generation' promos'.
As crazy as this might sound, that was a highlight of watching the series in first run. The episodes were awesome, but I'd always be like "Can't wait till we see what the next one is" and you have Don LaFontaine doing the "Next Time on Staaarrrrrrrr Trek: The Next Generation" and I just got psyched up. I really wish those were included on the DVD sets.