Of course Lazarus and IMToD are the best but this one goes close second. The pacing was so good i couldn't beliebe the ep last 45 vinutes, i thought it was like 15?
I can live without watching any of sam related stuff (and rewatching with FF button ready helped a lot) but Dean's stuff? OMG! That was wonderful!
I have some questions about Purgatory too but it's too early to decide they won't tell us anything about it. I mean they still have time to explain some things happened there. But even with no explanation my imagination filled the gaps and i'm enjoying Purgatory story very much.