I've been using a Badger dual-action brush for over 40 years. I'm only on my second one. Badger is made in USA (Chicago) and the brushes are guaranteed for life. Seriously! I sent them a 25 year old airbrush and they restored to new condition for the price of shipping. I've also been using a small Badger diaphragm (no oil) compressor since 1977. It's still working, but... to do fancy work with an airbrush, it really helps to be able to adjust the pressure. The single cylinder/no reservoir compressors lack this feature. They also cannot store air so when you spraying they're running. This does create some pulsing in the line and is noisy. I'm in the market for a new compressor now, but am not happy that they're all Chinese.
Double action lets you vary the amount of air AND the amount of paint at the same time. This is a very useful feature. When spraying smaller areas and you don't want a lot of paint, you just don't pull the trigger back as far. Yes...it does take some time to learn, but it's not that difficult and all it takes is experimentation and practice.
The worst part of airbrushing is cleaning. Most acrylic paints build up around the tip quickly, and when dry need acetone to break them down. It often takes me longer to clean the air brush than to do the paint job. That being said, it's really the only way to make a consistent professional looking finish.
Don't use "canned air". As the pressure is released the can gets colder. As it gets colder the pressure drops (Charles and Boyle's Gas Laws at work). You then have to stop and warm the can. Pain in the butt, and it's expensive.