I'm not a big fan of spring knives, simply because i have lost two overboard, both times when I tried to open them with greasy hands. Sprung right out of my hand and gone.
You're not supposed to get the "flying" models for that very reason.
In my earlier post I was reluctant to relate one of my experiences with a spring-loaded knife... a friend of mine (security police) had one on his belt, and I asked to see it. So he hands it to me, and I'm looking it over, pawing around on it and he gets really nervous, and finally asked to have it back in a funny voice - I had been holding it with my finger on the "trigger" where the blade would have opened me up had I pressed it. He didn't tell me it did that, and I didn't suspect.
His was a police model, and if accidently triggered, would have made quite a mess.
I can one hand a Spyderco just fine, thank you.