UPDATE: I went ahead and bought a dupe of my ZT0620. . . . . . .
It is perfectly suited to my needs, with the wave and the thumb disc, blade size/shape etc.
I thought about buying something with slightly different features; however, I am aware that I have the potential to become quite obsessive about accumulating things, and I notice that once you start it can be hard to stop.
Not that anyone around HERE has that issue. . . . . . . . . !
Sadly, I have several expensive hobbies and I am trying to avoid making blades another one. It may be too late, but I think I can stop.
I quit smoking lots of times! So it can't be that hard.