I bought a set of these to increase my run count on the small local hills. They are 90% of what I'm looking for in a rear-entry binding. When adjusted properly, they are nicely responsive. They also have most of the features you expect from a high-end binding, like a minimized surface area baseplate, cush padding, light weight, and canting. The signature feature is the NASTY strap, which is basically just a hinge that lifts the ankle end of the unified strap up when you drop the highback. This allows you to keep the strap tighter and still be able to get your boot into the binding. It's such a good feature that I couldn't see buying another Flow binding without it.
There is one major flaw, unfortunately. The ratchets are designed with a locking tab to prevent them from tightening unintentionally. These tabs inevitably unlock on their own after an hour or two of riding. If they unlock, the strap can snug down on its own to the point that you can't get your boot into the binding anymore. Since fast entry is the defining feature of a Flow binding, having to screw around with the ratchets defeats the purpose. It means that you basically need to check that the ratchets are still locked after every run.