like the turntable style heels? they are the safest binding out there basically, the heel will come off in all sorts of weird situations and directions that a normal heel wont, thus saving your knees, and they hardly ever pre-release because of how the heel and arms apply pressure to your boot, as well as a better energy transfer from boot to ski edge because of how the arms are angled, and they have a very small mounting footprint letting the ski flex more naturally like it was intended.