They have no laminate on the topsheet, just paint on wood. You get one good sized chip in them, and you then have a good amount of wood exposed that can then soak up water, eventually ruining the ski. I have seen it happen.
Surface park skis suck too haha, I know that from personal experience. (the cheap ones anyway, people seem to like double times/watch lifes)
2bi4 is lightyears ahead of 4bi9, whens the last you saw someone build a house using 4bi9s? -jfletcher