oh david... i would imagine the z28 to be constructed with only the highest quality carbon fiber and kevlar combination making them ideal for bomb-proofing your fall out shelter.  but of course they don't make binding with numbers that big so, overall i wouldnt recommend a "Z" anything binding unless you don't ski real hard or aren't in the park a lot because the plastic pieces under the heel pieces crack. the salomon STH bindings do have metal heel plates, and I think, are a good binding.  or you an buy dave's binding, the Rossignol Lead Weight 12, jk rossi's work well too and are def more durable. peace.