I've ridden flow and cinch. They were both alright but I really like regular ankle tow straps much more. The flows were 2010 models, their all mountain binding NXT-AT. Here's a few things noticed. They aren't fun to set up, you cant swap boards with your bro's easily, if this is something you like to do stay away. Once they are setup they work well, and actually did cut time off getting strapped in after getting off the lift. Riding them, once finally dialed in, they felt good. Pretty solid. Their weight, they weigh more than my 2009 model ride delta mvmnt bindings by a noticeable amount. And the biggest pet peeve for me with those bindings were in the powder. They are SO hard to get into and actually take 3 times longer than regular bindings in powder. So if you hike a lot of terrain, or ride tons of pow i wouldn't recommend them. BUT for if you are riding groomers, and never swapping gear, they are great- and faster than standard bindings.
The cinch i only rode once, one a groomer day so i dont have as much input. But for some reason i wasnt a huge fan of those either, same with GNU's binding system. It might just be me but i trust the tightness that i feel when strapped in with a conventional binding.