PEX

Have any of you tried PEX or a manifold system and if so what do you think of it? PEX is used extensively in europe and at the plumbing show there, copper was not a consideration for most residential use, only commercial. When I asked why they all pointed to the corrosion problems and said why would we use a product with a 50 year life when we can use a noncorrosive, Health and toxicity approved product that lasts 70 to 100 years. Im interested in your opinions?