I never really understood the facination with flows. Two of my friends who use flows love them, but I can strap into my Burton Customs with clumsy ratchets before they get their boot in their binding. I find myself usually waiting for them. If you like flows because they work well aside from the strapping in aspect, then sure, go flow. But I don't understand the people who by them to strap in faster. Maybe my friends are just slow?
Kind of had nothing to do with the OP's topic, so let me just say, no, I've never heard of such an injury happening with flow bindings.