chrome tech is a fancy way of saying "we're too cheap to make them real chrome, but consumers are too stupid to know the difference, usually".
My Grand Am GT has chrome tech rims, and while I like them, because GM was right; most don't know the difference, I think it's shotty.
I have not had any peel or anything, thought they scratch lightly, and you can see them close up. Nothing terrible.
However, I HIGHLY recommend keeping them clean and polished, and protected if possible, especially the lip, because the silver "paint" is cracking greatly on my GT's rim lip.
Hope that makes sense.