A flipper is a solution to a problem I don't have or a cute toy to impress and/or scare the natives. You know, like AO. Any resistance to opening like a bit of pocket lint in the wrong place and you're half open and either swinging it wildly to get it to lock or grabbing the blade to open by hand. Simpler is better. Also, it leaves the flipper in the way for some cutting tasks so you can't rock it down and use all the blade, other than the OD-1 which gives no hanging flipper but relies on a rattly mechanism. I'll stick with my holes, thank you.