Finally got to handle one of these at the Chicago show this weekend. I've played with my cheap Jacob's Ladder long enough where the motion is natural, so if this knife is viable, I'd have found out.
Truth be told, it was way too stiff for me to try out at the counter, and once the knife is opened, it is, as mentioned, a guardless finger hazard.
I'd say it's a gimmick, and a way too expensive gimmick at that.