I've had the 2k12 (black/blue glow) for about a month and have played in them for about 10 hours or a bit more. They look great, and seem to be very durable, but I wouldn't buy them again.
IMO, the 2k12 is too narrow in the forefoot and too big in the heel. They're also too stiff for my taste, the tongue is too short and the lacing system is overly complicated.
I much prefer the Vapor 9 and Asics GR4.