The whole thing is thus simplified. So this would be the binding to get if you are starting all new and want releasable bindings. Voile offers the only easy to find releasable binding in the U.S. as of yet. Critics of Voile releasable bindings will say that the plastic threaded barrel that houses the spring can be broken should it ram against a rock or tree. Since this houses the adjustable spring responsible for keeping the binding attached to the ski you would have to walk out if you smashed it.
Some people carry that part as a spare for such an emergency.
The Black Diamond Riva bindings utilize a cable that fits in a groove on the toe piece. If not under tension it comes out of the groove and is not attached. The cable clips on the heel of your boot. You must clip it on the groove in the rubber sole of the heel. If your boot doesn't have a groove don't use this binding.