I had no prior experience and managed to get it to work quite quickly and I’m quite comfortable using it in public restrooms now, after a couple of weeks. It has a good size and shape, but the balls are quite hard - which might be to make a more rigid base for the cup, but it can get a bit uncomfortable to sit down with for several hours, or ride a bicycle. I got it without a packing harness/underwear so it moves out of place quite easily, and because of the cup shape it can end up in pretty awkward positions after standing up from a squat or doing other movements. So I would definitely recommend some sort of harness or STP underwear. In terms of the color, I have very fair skin so went for the C2, but would go darker if I could order again as it would look more natural.
These are just some things to be aware of, but altogether I’m very happy about it. Completely life changing!