I tried the 2011 CobraSharks which have a wing design like the Infidels. I loved them. So much so that this long-time Burton bindings hater is going to pick up a pair of 2011 Burton Malativas (also a winged highback, but in EST) when they come out.
I felt that the wing supported my presses better. What I liked most was the comfort. I'm sure the Infidel is the same, but the Cobrasharks were nice and comfy