First and foremost, if you haven't seen the previous 5 installments before you see this one, it won't be a problem but I highly recommend it.
I went to see this movie with a slightly low expectation. I mean after Fast Five, I did't see how the next one could reach the ceiling of the previous one, but to my surprise Fast and the Furious 6 has climbed its way into the attic.
A great combination action, racing, comedy, plot twists and an unexpected ending.
If you liked Fast Five, this movie is a Must Go.
Don't leave at the credits for a sneak peak of the Final Installment of this franchise.