Expensive but useful
If you're an old hand with the airbrush, you probably won't need this, but for anyone new to airbrushing, this is a very handy guide to all things airbrush. I'm a retread modeler, coming back to the hobby after forty years away. Back in the day, painting for me was one brush, a bottle of Testors enamel, and the thickest coats I could put on the plastic. There were airbrushes then, but I didn't know anything about them and they seemed so complicated to young me.
Current day me understands better that the airbrush is a game changer, speeding up painting and making even a bad painter look good through the magic of atomization. I'm still new to it and already my developing airbush work blows away my brush work.
If you're new to airbrushing then this guide is a worthy purchase. Yes, you could get some of this information from videos and articles, but this book really does cover it all: the equipment, the physics, techniques, and troubleshooting common issues.
I did feel one of the book's points as a bit too strong. The author universally dismisses all cheap airbrush sets as trash. But I feel this is too harsh. Today you can find affordable bundles online that include a compressor with tank and a set of starter airbrushes. The compressor is an established technology that's been around for decades, and even the small hobby ones with tanks are pretty reliable. The airbrush is a bit more complicated to assess; it's true that higher cost brands are likely better engineered and made of higher quality components, no disagreement there. However, not all cheap airbrushes are the same; some are quite good, and fundamentally, the airbrush, like the compressor, is an established technology. A commoditized offering can still be sufficiently functional, especially for modelers who often don't need the same precision as an artist. I'm still using the cheap pack-ins that came with my compressor and they're acceptable for priming, base coating, and any job where the masking is doing the real work (which for modelers is a lot of them). So I would suggest that readers be aware that there is a varying degree of quality among airbrushes and to check some reviews, but price doesn't have to be a blocker to your use of an airbrush.