the heel tray on s912Ti's is titanium, not aluminum. if the toe peice is set correctly and they were mounted by a competent tech, they work perfectly fine. also, like several people said, they release very accurately.
marker bindings blow up if you land backseat. i've seen it happen plenty of times. with other bindings, the toe can release vertically. with markers, it cant until your boot kicks out to the side. hopefully the binding breaks before your knee is torn apart. also, they have next to no elastic travel, which, like someone said above, means you are either in or out, there is no in between. elastic travel will give you that split second to regain your balance, but on a marker, you dont have that.
the mojo 15 binding is the same design as the td8, which is a much more solid binding than the current ld12. its a little heavier, but the construction is much sturdier, and the mojo has a din of 15 too. they dont have a turntable heel, but the heel can kick out to the sides a bit to reduce knee strain.
atomic bindings should just be out of the question. every pair i've seen get a binding check this year has failed, miserably. the forward pressure sucks, and the mounting length is really long.