Loved them both. The cinematography is the same as BB and made me feel I was right back in the that universe, so I didn't find the first one slow at all. More nostalgic.
I'm not sure the familiar faces are even needed in the show as they've done such a good job of capturing the feeling of BB, but they will no doubt write in good stories for them.
As for knowing where it ends - /spoiler they showed Saul sitting at the start watching his old commercials, meaning the show has the potential to go well beyond the end of the BB timeline. In spite of that I think I'm gonna enjoy the journey there. However I can see me getting pissed off with my lack of memory when more familiar characters come in - I can't even remember how Tuco came into BB.
