Just started using this airbrush after getting it as a birthday present (in June! i was too scared to use it in case i broke it or clogged it or something typically klutzy)
Was using Aztec A470 and Hansa 381 and i can't praise the Iwata enough. It feels absolutely solid, perfectly balanced, and the action is smooth as glass, I've tried acrylics, enamels and lacquers through it and it has been absolutely amazing. The spray is completely consistent even for prolonged periods. Clean up is relatively simple and the thing just ticks along brilliantly. The double action is fully responsive and the micro-adjustment ensures that you can make small adjustments to the airflow immediately without fiddling with the compressor pressure knob.
I can probably make the analogy that it must be like losing your hearing for years and then you suddenly get a hearing aid. You wonder why the heck you put up with it for so long! I feel like i'm ready to do some serious modelling at last.
If you can afford it i can't recommend it highly enough. Mine came from Graphic Air at the steep price of £176. (The all-metal Aztec is nearly that much, and the Hansa weighs in at a tad over £100 and this is more than worth the difference.
Cheers,
Alan
*Disclaimer! This is the first proper airbrush i've ever owned, so other leading brands are probably just as good and available from reputable retailers!