These are a game changer. I've been rocking an adpter and ny fat for a year or two but these are just so much better. I wish they made these but with a lego type spray, Ik theres precise caps but they look too much like stock tips.
It's definitely a good mop. I find art primos nibs to not flow as much as I'd like, but I only run thinned paint in them. This being said, I just pop out the flow restrictor and pin some holes in the nib and I'm good to go.
I always mix a bottle or two of this stuff into my homemade acetone pen ink to make it pure black. I see some people mix it with alcohol, but xylene and alcohol dont really mix, so I would suggest using acetone with this so you dont have to shake every time.
Ive been using the montana acrlyic 15mm for years as my go to, I dont love OTR, their nibs are too hard, though the montanas are soft and can wear out fast if youre not careful. This pen is the perfect in between, and to top it off, has a reversable nib. Only issue I've had is the inside of the cap can fill with some ink if the nib is juicy and can make a little mess when opening.