It is unstable, though their stability, accuracy and distance in the last launch was rather impressive, and the liftoff footage was nothing to laugh about. Having said that, if it comes down on some South Korean island and kills villagers, you can expect war in the following 2-3 hours.
Would have been a good test and the North Koreans couldn't prove a thing when their missile exploded in mid flight.
Well, we have Food Stamps to pay for so something had to go.