I have it in the UK, and you don't get all the video streaming benefits of US prime membership, but you do get the kindle book rental thing. Next day deliveries for orders up till about 17:00 are great, and a luxury I wouldn't like to give up.
Having said that, I don't pay for it, my Dad wanted it, and realised that even though he doesn't live with me or my siblings, he can give us each one of the 5 household slots, one for him, one for his wife, and one each for my siblings over 4 separate addresses. From that point of view, amazing value at £10 each, although it leaves my wife jealous that she doesn't have it on her account.