Well, on day 83 I had a proper upward heel release from both of my skis simultaneously. I was skiing with very poor visibility (fog/snowing) on ungroomed tracked out deep snow and I went up and over a large bump to then spear my tips into the next steeper hidden bump causing me to fall forward. Both bindings properly released upward at the heels, and I landed in soft snow clear of my skis as I should have. No resetting of the heel pieces was needed to step back in and continue skiing.
As of ski day 84 on Kneebindings, I've had no pre-releases, and have experienced proper releases in all three directions from assorted falls.