Hey, Series 1 and 2 are the american version but the rest are the crappy Australian versions because i had brought the majority of them before America had even released the friends sets, the only reason i had to buy the American series 1 and 2 is because for the life of me i could not find season 1 and 2 anywhere!!!!! so i just settled for the US version, personally the only thing i dislike about our version is that they're flip disks which you have to be extra careful with or they scratch easily, the US special features aren't that great, i would love the audio commentary though, and i just brought season 10 it has FEATURES lol, a 45 min doco, a 3 part 55 min friends of friends featurette which interviews the gueststars over the years including mr and mrs gellar, 30 mins of bloopers - very funny, friends around the world a 7 min featurette about the show being broadcast in other countries hosted by gunther and a easter egg where we are shown fans of the show - stupid, but the feautres are great!!!!! and each episode in the series is the extended cut with most of them running for 25 mins instead of the regular 21 mins some episodes run for 30 mins so its well worth it, i love friends, i think im one of the biggest fans, i own all the dvds, the book, the board game, a mug and i'm getting my friends who is over in america to bring back even more friends merchandise!!!!!!