I have had them all I think and got rid of all for some reason. The 562 I got rid of because the flipper/detent ball geometry is just not done right. On a flipper when releasing the lock and the flipper tab hits my thumb, the detent ball better be cleared at that point so I can just move my thumb and let it fall. This knife’s detent was never cleared unless I moved my thumb way back where it was not designed to be, or did a double release kind of deal. Hated that. A misstep imo. But hands down it is the best looking of their whole line up for me. But since I fidget with my knives that flipper design killed it for me.
As for, the 801, the edge of the lock bar just wore me out after repeated releases. Too thin thus causing it to dig into my bony fingers. Preference thing I just couldn’t get past. Another one I let go because of the lock bar.
Now, the 220 was perfection. Flipped like a dream and perfectly designedsuper on flipper and lockbar. While a little boring in its looks I could have lived with that. It just had one negative that made me let it go; too heavy. If they milled out those scales and dropped it an ounce then that would hands down be my favorite ZT. The weight was my issue with the 456as well.
I could go on, but of the 15 I have had I only have one right now - a 452.