I bought one, (A470), when my old Badger Airbrush died. Back then, too long ago, the price was good and it was the best I could afford. To be fair, I've still got it and still use it to do large(ish) areas.
The only issues I've had are that the fine tip, (tan, I think ?), is really only suitable for something of the consistency of inks, which is what they say.
and the trigger sometimes feels a bit 'squidgy' compared to say an Iwata, but is still controllable (is that a word ?).
Other than that, I've not really had any problems, it's easy to clean, (you can take apart the nozzel bit), and pretty simple to use.
EDIT - What paint / reduction are you using ? I might try again with the fine nozzle