So....I'm looking for thoughts on layer thickness.

I have recently printed out a number of these for myself and a coworker: https://www.thingiverse.com/thing:213990

They look great, and everyone is quite happy with them. However, when I was doing a pair of them for my coworker and his son, I decided to print one at .1mm thickness, and the other at .2mm thickness. Nobody, including me, can tell the difference.

Is that mostly because it's an (extremely) organic shape? When printing at .1mm am I just wasting time?

Thoughts?