My wife has been using those fast blast type. She sprays acrylics on
canvas, bought the caps with tubes that fit the paint bottles and loves
how quick she can switch between colors.
I played around with the AB a bit. I'll probably be spraying mostly
enamels to start and I want the thin glass bottles (1/2oz - 1oz) with
the metal caps and nozzles. I tried some of the different sized plastic
bottles that came with my Iwata setup, some were too wide (fat) and got
in the way (felt uncomfortable).
But who knows... that could all change once I start getting busy with the AB.