"I don't like the o ring and may try the surefire switch blade during the off season. I've asked for some opinions on it, but so far no takers."
If you don't like the o-ring, try the grim reapers. We've had great results with them. You can shoot them in either position, open or closed.
I shot a doe thru both shoulders one time. The gentleman who used to process my deer meat called me a liar when I told him I shot it with the bow. I had to show him the blade marks by peeling back the meat to reveal the wound channel.
I like them and haven't had any problems, except friends wanting to borrow them.