i just got a set but i find the wider the tip (i have 0.7, 1.1, 1.5, 1.9, 2.5, 2.9 mm) the harder it is to use them. granted, I'm only using the 1.1 and the 2.5 rn, but the 1.1 writes a lot better. 2.5 often cuts off and stuff.
also, the 1.1 i tried it out with yellow because I didn't want to...