Don't worry about those Gnu binders, they work great. We used to be a Flow dealer, picked up Gnu binders a few years ago and put them in the demo program. The positive response we get from people who try the Mutants is very real. As a result of letting people ride both before they buy we stopped being able to sell Flows, we dropped Flow. We sell more Gnus every year than we ever sold Flows and are usually sold out by Feb. We never drank the Cinch punch, they haven't gotten any love from our product testing team.
This is just the response we get in our shop, other shops have different experiences.
We sell Flow, Gnu and Roxy rear entry bindings. They all
have, and are, stoking riders with great products. These brands have taken big steps forward (again) this year. It is hard not to think that this area of bindings is undergoing more development and refinement then conventional bindings.
The NX2's this year have added cant, full sized ratchets (fully releasable for conventional front entry), ratchet locks, NASTY, One disc that fits 4 hole, Burton 3, and Burton Channel, ToeCap Strap (some models). While the production models have not yet been ridden or reviewed by anyone that I am aware of, the in store reviews on fit are off the charts.