The End of Lost

Ok, the end of Lost. There will be spoilers here if you haven't seen it yet!
So what the hell happened? I've really enjoyed this series but I'm still trying to figure out what happened two days after I saw it!
1) The island was purgatory and they all died when the plane crashed?
2) The events on the island were real and the flash-sideways story was purgatory and they all met up there and 'moved on'?
I don't know really and still so many unanswered questions after 6 seasons. Who was Widmore? Why all the Egyptian mumbo-jumbo? etc etc .
Maybe because a lot of people guessed that maybe the Island was purgatory from Season 1 the writers got annoyed because they wanted to be a step ahead of us, so played some games but went back to their original idea at the end?
Answers on a postcard in the comments box below!
Still, I'm happy with this ending. It's hard to end such a popular series and please everyone. Now watching final season of the Wire and waiting for the last series of 24!

Currently listening:
Kyuss - ...And the Circus Leaves Town
Deftones - Diamond Eyes
Harvey Milk - An Act of Human Kindness