You do not want bent metal, flow, or burton bindings. Bent metals are pretty basic, but their straps (the part that connects the cushy part to the base) feels really cheap, and the rachets dont feel like they will hold up (I ride super hard though). My buddy has some and he doesnt ride that hard and he has had problems with them. In my opinion flux bindings are some of the best bindings out there (as long as you dont get the base model) I had some Flux emblems from 2007 and tehy held up for 3 seasons, and about 3 weeks ago I got some flux Distortions and they have been every thing I've wanted. The super bendy high back doesnt feel much different from my Emblems but the rachets are much improved over my old emblems. The other nice thing about flux (if you are a jibber) is that flux makes a high end jib binding. First lets define "jib" binding" a jib binding is a binding with low response, good board feel, a lower profile high back or a flexible high back and you can tighten your boot down super gnarly (aka these bindings suck for mountain riding) it might also be nice if the binding has tooless adjustments just incase you do throw down in some back county. Most companies "jib bindings" are just a very low end model (such as the burton freestyle) Flux makes a couple lower end "jib bindings" but they also make the super emblem, distortion, and titian rk, which are all high end jib bindings.
As far as burton goes ... all of the toe caps, and strap part that connects the cushy part to the base are carp. I know lots of people that like them but all of them have had problems with them. A buddy of mine who was a pro for a while says that he loves burton bindings, he just didnt like to always have to worry about where he was gong to get parts from to fix them. If you go to a store and feel the male end of the strap of a burton bindings and compare it to a flux one ... theres no comparison, the burton straps are far inferior. I've also rode a number of burton bindings this year that were just plain uncomfortable because they put so much padding under your forefoot and heel and leave your arch to support itself.
I also know a guy who broke the heel cup on his p1's which is something that should never happen.
however it is nice that burton gives all of their bindings lifetime warranties but you still have to take the time to send it in and NOT ride.
I will give props to burton for their EST system. Its pretty tight that the binding can flex with the board, but snowboard boots aren't exactly as touchy feely as a vulc skate shoe, so I honestly doet know how big of a difference it can make, but i still give props to burton for their est system.