"AutoCant is a new padding technology put into the BEDs of some of our key models.  Unlike traditional cants that force a rider into a specific canted angle, AutoCant forms to a rider’s natural canted angle.  The wider the stance, the more cant; the more narrow the stance, the less cant.  There’s no need to think about it, AutoCant adjusts automatically.  The way it works is relatively simple – on the inside (medial side) of the pad, we use a softer, less dense foam, while on the outside (lateral side) of the pad, we use a firm, more dense foam.  The difference in density allows the boot to more easily settle into a natural canted position, depending on the rider’s stance width and angle."

Also Unions do not have canting options so its not exactly a one for one comparison to bindings with cant beds if thats something jhoang is looking for.

But the force SLs are probably the best option available if youre looking to spend your binding coupon on something.