I used a badger 200 and had no problem doing fine lines down to about .5mm .
I've just converted bac to my Aztec cheapo £20 jobbo.
I have a problem with the badger at the moment. It is drawing air in through the nozzle somewhere and its backing up through the brush and blowing bubbles into the paint cup. talk about a pain in th arse!
As your painting the paint is bubbling up over the cup and onto your hand and sometimes the shell.
So I'm converting back until I can afford a new Iwata.