The flex shouldn't be an issue. If the ski bends, the stress is on the heel piece.
The pivot is placed fairly ahead, which makes a not so ergonomic walking mode, compared to Fritschis or Markers.
Why use one of these compared to Marker Dukes or Fritshi?
This setup may be burlier on freakin huge cliffs, but it's pivot wouldn't motivate me for hour long ascents I guess.
So for small climbs now and then, to access knee-jamming-huge drops, I'd choose that over a marker. Other than that Marker/Fritschi/Dynafit suits better as touring setups. Those combos cope with drops as well (some modification might be needed), but not as high and often as on a proper Alpine binding.