I have a size 1 that has become a go to for me. It's easily on par with artis opis. I decided to try out a size 0 and a size 2. Oddly, the size 0 is longer than the size 1. It's shaped more like a rigger or a liner than a round.
However, it performs very well. Good moisture retention, paint flows of nice, good and sharp.
I would prefer it was 10-20% shorter, but one playing with it a bit I've gotten used to the length.