I had nine amalgams and a crown replaced with the diamond products two years ago and they've held up just fine. They feel like regular teeth. I did do the compatibility test first and it said no problem. I probably didn't need to do it but I figured with 9 of them I'd like to not have to worry about it after the fact.
I probably shouldn't say this but I still eat popcorn. Sometimes. Even the partially popped crunchy kernals. But I do it carefully...
That diamondlite is some tough stuff. I think it's stronger than my real teeth.