Bob,
I've had quite a few cheapo Chinese airbrushes, the 0.2mm brushes haven't been much good, - sticky needles, blocking nozzles - but the 0.3mm nozzles are OK - I've bought replacement needles, nozzles & nozzle caps from AiliExpress with success ( better than throwing things away! ) - very cheap, but you have to wait!
The brushes themselves work fine - some of them aren't the most comfortable to use ( one of mine has insulating tape wrapped round it to protect my delicate fingers! ), and cleaning them can be a bit laborious. However for spraying primer coats & all over base coats they are excellent - you won't get thin lines, but that's what your expensive
airbrush is for! If you use masks, then you've no need for a fine
airbrush anyway!
The
airbrush is a tool - on a completed model, it's irrelevant what
airbrush you used - it's the finish that counts. The
user is the key - practice & practice with the
airbrush & get to know it's limitations & strengths & always clean it before storage.
I bet Vincent Van Gogh would still produce masterpieces using the cheapest brushes & paints from The Works! - Just because an
airbrush costa lot of money, it doesn't guarantee a prize winning finish!
Dave