I thought that was a great 2 hour episode. I had to wake up at 5AM to watch this on SKY one HD, it was well worth it though.
I can't believe SKY cheated us though, they said it would be aired the same time as the US, yet the East Coast aired this 3 hours earlier than the West Coast which the UK aired it at the same time as the West Coast. (Total shambles) I knew this was wrong because I usually download Smallville - Supernatural - Heroes etc at 02:00 - 03:00 AM.
A bit of a spoiler so don't read below if you haven't watched it.
The ending was a little strange but I think everyone in that room had actually died, I'm not entirely certain but a few of the couples wasn't in that room so was they still alive :D? I'm not sure so as someone posted above someone reply with some useful insight on what happened towards the end?