No knocks on the other brands and airbrushes (becuase I haven't used them), but I love my Iwata Eclpse gravity feed AB. It's a true work horse, easy to clean, easy to maintain, parts are readily available should you need something and it is relatively cheap. I've had it for over 5 years with my biggest issue being I needed to clean it out better.
I use it for everything but fine detail work, for which I have a Sotar 20/20 by Badger.