Yeah, I do front squats a decent amount. When I first started it took a bit of mobility work to be able to comfortably hold the bar in that position, but a few years of it being in the repertoire got that mobility/flexibility in place to where it isn't at all uncomfortable for me.
My failure point on front squats is the loss of balance on my way back up, when my legs and lower back are fatigued, where I tend to want to lean forward (which throws off my whole balance). Raising my arms/elbows higher helps, but then my arms and traps get tired. That's why I was wondering if Zerchers would be even more punishing of errors in form.
Above 200 lbs the minor imperfections in the movement really get amplified, so I appreciate that immediate feedback. I imagine Zerchers are the same way. Maybe I'll try them out next week in the gym, see if I can do a set and see how they compare to front squats.