....or that quite a few people use them and may not have read this thread, or had time to respond.
I've been using the cheap one from Harbor Freight, but just upgraded to the one that costs $5 more. Then, the same day I got that one I had someone give me a Badger 155 set. So, I'm refining my techniques to include actual control instead of just point and spray. They airbrushes give a LOT of flexibility to using dyes, and I'll likely only use this method. I find it's incredibly easy to get even coverage, the feathered edges Particle mentions, and also to vary the shade of the dye by just applying less. Sunburst effects are really simple too. If you have a compressor, you can be 'operational' with one for about $15. If you don't have the compressor, you can get the whole set up for about $90. If you prefer to just invest in quality at the start, good starter airbrushes should set you back nearly $100 for just the airbrush, top name compressors (run quiet types) can easily be $200 or more.
I will vary whether I dilute the dyes by my need at the time.