Eccelston did a fantastic job as the Doctor and Tennant just gets better and better as the series progresses. The wonderful thing about this incarnation is that you don't have to have been a fan from the early days. The show is accessible to new viewers, while holding onto the history - as evidenced by Sarah Jane and K9. The story telling is marvelous and it's great to see a show in this day and age that does not always wrap up at the end of the broadcast hour.
This series has drama, humor, tragedy, everything you could want in excellent TV. For the new viewer, and the old, we learn more about how the Doctor came to be the last of the Time Lords, and he gives out tidbits of his history for the new viewer.
When you get these DVDs, sit back, relax and enjoy the ride. It's fantastic!