Vik, thanks for your input on vouching for the durability. They certainly are interesting.

I have no interest to go with the cranks you need for these pedals, otherwise they'd be on my list. I'm going to pass them on to a friend who likes the heavy-duty equipment though.

Ended up going with Crank Brothers Eggbeaters, which are certainly another cool looking set of pedals - I don't think i'd use the Eggbeaters for the heavy stuff you see these pedals doing, though.