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I have the new FKS180 and I can absolutely say they have a vertical toe release. 2 ways to see this... either crank the forward pressure way up and slam a boot into it (you can see the toe rock forward to try to make room) or you can back the DIN way way out, like past the bottom of the scale, and then you can pull on the toe and make it roll forwards.
Plus I've ejected from one of them vertically. Saves you snapping your ski behind the heel if you have a REALLY heavy backseat landing, I reckon.
Most of the split-toe designs don't have a pure vertical release. Some will allow your toe to kind of roll out but only once you've already released most of the way laterally.
As I understand it, the one-piece FKS toe is basically on a ball/socket mount, only the ball isn't round, it's kinda cammed/egg shaped, meaning the spring will push it back to centre naturally. The toe can move any direction in a 180 degree arc over the ski, and the force required on any given angle is a result of the shape of the surface the spring pushed on... so while you may need 10 DIN worth of force to eject laterally, you'll get much more retention vertically, while still coming out if things go horribly wrong.
To Op. you will be fine with the STH 14 Driver its a great binding. I have not seen any problems on any STH driver binding. People somtimes claim they delvolp slop like the poster above but 9.5 times out of 10 is that the binding is not set up properly.
In over 10 years working with salomon I have only seen a couple of pairs break, and usally its through miss-usage, trying to use a AT boot with a driver toe for examle.
In my opion the STH is the best binding available currently.