I learned how to snowboard on Flow bindings, and they're really easy for beginners to learn on. I've only used their rental model, but even then they can keep your feet locked down pretty well with not much effort off the lift. But as you start getting better, I fely the full-face strap that Flows use don't give the support in the right areas as regular strap bindings can give.
Right now, I own a pair of Burton step-ins (which i recently shattered after landing a jump, but that's another story), and I had to rent a pair of strap bindings ('02 Burton Mission Dark) as a temporary replacement. I have to say the strap bindings do feel alot better, and i felt i had a much quicker response when carving, especially going at high speeds, than Flows, and much better than with the Burton step-ins.
My gripe with straps is when i get off the lift. Most ratchets i've tried (tho i haven't tried many top-quality models) piss me off considerably. I'm a lazy boarder when it comes to this, so I went with the step-ins. The Flows are a good mix of support and convenience I'd say. That's my 2 cents.
Anyone have suggestions to strap bindings that have easy to use ratchets? I've gotten suggestions of Burton C14, Drakes, or Tech 9s...