This is a Kershaw Leek. Assisted opening knife. It is as fast as a switchblade to open, and legal most everywhere, where switchblades are not.

I won't disagree about the learning curve, or painful part. I will add, however, that my stubby inarticulate thumbs find balisongs far easier to open than any blade with a thumb stud. Of course others MMV on such things.I'd buy an assisted opener before a balisong, the learning curve isn't as steep or potentially painful.
While automatic does mean the blade pops out by pressing a button, not all automatics are switchblades. Some automatics are called "front openers" because their blades pop out the front when their buttons are pushed.Does automatic mean it is a switchblade, where the blade pops out by pressing a button?
You can find a wide variety of knives at a wide variety of prices, but they will also be in a wide variety of quality. Google "automatic knives" and it should bring up a whole bunch of sites that sell them.In the less than $100 range?
My Gerbers came with a small paper explaining why they're not a switchblade. That stays in my walet.I carry a Buck Serius assisted opening. I carry it clipped inside my left pocket when my right is filled with Colt Mustang .380! Had an interesting experience at Hoover Dam. I made sure to leave the .380 AND spare magazine (that's another story from Gateway Arch in St. Louis) in the Jeep but forgot about my Buck. OK, get in line and empty your pockets into the tray. (Man I hate that!) Guy picks up the Buck and asks how does it open? So I told him and he almost went ballistic. That's a switchblade! You can't have a switch blade! Ever try explaining something to one of those guys -- like it's an assisted opening knife NOT a switchblade? Don't bother! He ended up telling me to go back to my car and lock it up. Man! That's as bad as trying to get through an airport! After all of that, I made sure to go on the long tour to make up for it.
I like my Buck -- it's a good knife for the money. I ran across a special deal and picked it up for less than $50.
Good thing you didn't blow up the damn with your pocket knife.I made sure to leave the .380 AND spare magazine (that's another story from Gateway Arch in St. Louis) in the Jeep but forgot about my Buck. OK, get in line and empty your pockets into the tray. (Man I hate that!) Guy picks up the Buck and asks how does it open? So I told him and he almost went ballistic. That's a switchblade! You can't have a switch blade! Ever try explaining something to one of those guys -- like it's an assisted opening knife NOT a switchblade?
....due to Ohio law...butterfly knives are named specifically as prohibited weapons, along with nunchuks...Too much movie-hyped excitement, I guess.