I prefer Moori's overall. I tried Hercules Mediums, but have had bad luck with them. In at least 7 out of 10 tries (and I have given up on them now), one individual layer of the tip will mushroom when all of the others stay in place. It almost looks like they put a layer of suede in the middle of the other layers. Can a poor installer make a tip go bad like this, or is it simply the tip is bad?