That stuffs rife in the UK right now. It's the 'cool' drug to be doing. Like the new coke or something.
Never tried it, but everyone's talking about it, especially around London. They've started making t-shirts with ket related slogans and things like that. Which are sure to go the way of the shitty, overdone weed t-shirts.
Never tried it, and the fact that it seems so fashionable to be doing it with a load of douchebags running round raving about it means I probably wont any time soon.