K2 cinches are just heavy pieces of crap. Seriously pieces of crap with tons of fucking problems.
Flow's been in the game for 10 years now and knows what they're doing. The flite line up though is poop. If you're looking at Flows try to pick up a deal on some NXT's its a solid binding.
The thing with Flows is you have to spend the time to 100% dial it in to your boot, this can take a bit of time. Personally I've used just about every binding combination under the sun. Flows are great if you have a foot problem, can't bend over, don't like straps.
Its just different strokes for different folks.