In all my (reasonably long now) life this is the first TV show that I have loved so much that I felt compelled to immediately re-watch from the beginning as soon as I finished it. I'm now on my 5th re-watch and it is so full of amazing things to keep you hooked, that each time I re-watch, I discover more. I love pretty much everything about it from the actors & writing to the amazing fan groups who still love & talk about it 2 years after it ended. That in itself should be a testament to how great a show it is. Full of action, humour, drama, love, compelling characters that you grow to love, marvelous cast... the list goes on. If you're looking to escape into an addictive TV show with 15 seasons then go for it, but be warned. It really is addictive.