My 1st heavy duty folder was a gen 2 SmF. After some issues, I went and bought the Hinderer XM18 3.5" gen4. Beautiful knife, got all the bits and pieces that I like. Then in 2015, I was introduced to an Umnumzaan, which I purchased and was very happy with it. A week later I bought a Large 21 plain jane and that knife won me over. Carried it since. Since then, I have sold off all my unused knives except for the 21, Umnumzaan, small griptilian, PM2 spydie.