It's good but I do have a few quibbles with it. First, its mostly the 25 Years show with some new stuff edited in. Second, they focus a lot on a few series in terms of highlights. I guess the "classic moments" were relatively concentrated in the minds of a lot of people (or at least those how made this show thought so.)
Hopefully someday we'll get a really long documentary on the show's history, something at least an hour long.