We cannot speak for Ontario's heat treat. I know if the past there were some problems but I *think* they got it fixed. The RAT Cutlery heat treat is now a straight heat treat (not differential) at 57 Rc. We have a test video on the web site that shows the flex we're achieving with this heat treat in 1095. It's pretty awesome for 1095 @ 57 Rc.
We also do destructive testing on every lot of knives we run.