Really enjoyed this. Not many sci-fi series reach 100 episodes, so the actors and crew can feel be proud of themselves for that achievement. I preferred series 4 and 5, where the high standard is maintained right to the end. Even new crew member, Doyle, added in the 5th series fits in well. It's good to see a show properly concluded before it is cancelled by the studio. This box-set was excellent with plenty of Extras worth seeing, which included deleted scenes and bloopers. The disk quality was excellent and there was no problem playing. Recommended.