I am like Mike, I don't consider any of mine that don't totally spring back to be a problem.
Son in law did have one that would just fall open. Sent it to Buck a month or so back and it came back yesterday.
It is just amazing what the guys at Buck do with these old knives. His was seriously used/abused by a past relative. Had the Chanpion Spark Plug logo on the four dot blade. Warranty guys polished the blade, all around the Champion logo, leaving it in its used condition. I thought that was cool. Of course it came back razor sharp.
As for the blade hanging open some, I have said before that the way I open my old 110 is to grasp it like in Dunc's photos, and snap it downward so the blade locks, and then just kind of flip it up and catch it by the handle.
So I don't mind one being a tad loose. And no, I have never been cut opening one that way. I think my smallish hands/fingers makes that opening method work for me.
Have seen and heard about others that don't have much luck opening one that way..... But I drift... sorry.....