I took these out on Mt Rainier last week and they were great...until I extended the heel risers 20 minutes into the trip. For reference, I am 175lbs and had a 40lb pack during the ascent and wasn't "jumping" in them to increase impact force.
The polymer frame supporting the metal heel risers is not sufficiently built or reinforced to withstand the pressure from the thin, metal heel riser pressing into it. This resulted in the polymer base "giving out" and allowing the heel riser to flatten back against the heel plate, effectively diminishing the benefit of a heel riser. Epic failure for sustained steepish terrain.
On a good note, the traction system on the shoe is excellent. I had zero issues slipping/sliding at all angles.
Overall, I cannot recommend these snowshoes, or in general, ones with polymer decks where a metal heel riser presses into it (if mountaineering is in your future). This area NEEDS to be reinforced with a metal receptacle OR the deck needs to be made of metal. These snowshoes would be fine for moderate terrain or extremely lightweight individuals.