I picked this up recently from the original owner.  It is a tank of a knife, but just a bit too chunky in the pocket for me.  This appears to have seen very minimal use and has seen no cut or carry from me.  The edge appears to be factory and is quite sharp.  The only signs of wear I can see from this are some scratches on the pivot screw.  The lock-up is solid in all directions, and the action on this is great for such a small knife.  There are some crazy prices out there for the ZT0900 as it is discontinued, but I am hoping to move this along at a more reasonable price.  This comes with a deep carry MXG clip installed, and also ships with the original clip and packaging.