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All I have to add is that I've owned two pairs of Line P100s which have a layer of metal. They are pretty light for a ski that size, so metal doesn't necessarily make a ski heavy. I don't know about bending, but they have certainly lost a bit of camber after a bit of use. To me this is no bad thing- I now almost have a bit of early rise which doesn't suck. Maybe slightly less effective on groomed but I don't mind. Compared that with my Line Pollard Soul Rebels which have seen a LOT of use and still have a ton of camber (no metal).
Metal can be a good thing. No metal can be a good thing.