When you think about Playdoh, the material yields to the pressure when you squish it; such is the design style of the Squished Pinches. A distinct squished bulge on both sides of the hold creates the incut.
The incuts in Set #2 are about 1/4" deep, substantially less than Set #1. Set #2 also has a tapered design, so different-sized hands lock into the width their hand prefers. The tapered aspect allows you to lock into the hold ergonomically speaking, making this set a great choice when wanting to set in overhanging terrain.
Set #2 feels V2 on vertical walls, V3/4 on 25-degree walls, and V6+ on 45-degree walls.
Set #1 is the easiest to grip in this series, with Set #3 the hardest.
You may also be interested in these other sets of Squished Pinches: