I have a couple of these and a trainer to boot. I don't usually buy more than one copy of a knife but these are amazing.
Moreover, if you're carrying a blade for personal protection it's hard to do better than a karambit. With a little bit of practice you can 'draw' this just by pulling it from the pocket, and the Wave will catch on the edge of your pocket and the resulting force will swing the blade right into place with a fierce lock up. With a little more practice you can draw and strike in the same motion. They are most dangerous when held in a reverse grip, index finger in the retaining ring, using brute force slash and raking attacks, which can be launched with devastating effect even when your assailant is trying to grapple with you and the two of you are rolling around on the ground. And once you've got the basics down with a karambit even a chimp can use one, and that's kind of the point.
They're great knives and this is a good price for them.