I LOVE impressions, I ty to do them (I'm told I'm good at a couple, but I can never do more than a few lines), but these guys are excellent, and they figured out how to make a show about that. I'm a fan of Meskiman (he's on Parks and Rec once in a while and his Youtube videos are awesome, I'll link to his Morgan Freeman haikus if I can find them), so it's nice to see him take the lead in a series.
I've just finished episode two. I keep rewinding and rewatching scenes over and over again, I can't get over voices I can't find the hooks for, like Harrison Ford or Bryan Cranston (they apparently LOVE Breaking Bad, since they keep referring to it).