Holst035, thanks for reply, that is very interesting news. Maybe I will try the clipcase after all. The accidental unlocking has occurred for me only several times when cutting fairly thick cardboard, so it was pretty strenuous cutting. I know--I should be using a box-cutter, but sometimes you don't want to go get it. Anyway, it was enough to make me wish for a liner lock.
The good news is, with all that abuse I have never had an issue with the blade chipping or anything, and there is still zero play when the blade is locked open. Thanks again.