I was looking at the contego and adamas when I discovered the ZT 550 and 560. I was worried the contego would be too rough textured and that the adamas would be too big. It's a bit more money but the 560 picture/descrption really changed my mind. (Especially since my ZT 0350TS is so well made.) It's coming this week. Looking at the two, the 560 looked more expensive and tactical (to me, anyway). The Elmax steel has me a bit concerned since it's in so few blades in the U.S. I believe Kai does the heat treatment but could be wrong. I wanted an unassisted flipper and this is certainly one of the nicest. 3.75" sounds good.
The rep at ZT really raved about the 560. I find it interesting that the ZT300 might actually cost a bit more.
Even if i really like it I still want a contego, adamas or bedlam (the bedlam would probably be for show).