That they are very very bendy.
One of my friend's had a set a few years ago, never hit a curb or a pothole. But the tyre was leaking and he took it into a garage and they said the tyre was fine but the alloy its self was so bent it was letting air out as the tyre wouldnt fit on the rim properly.
Although that was years ago, they might be better condition.
I've managed to talk myself out of the Pink wheels they are doing and going for black or white set.