Seems like y'all got this handled, I just wanted to add my two cents.
I have an Iwata NEO. It's a great little double-action gravity feed airbrush. I like the level of atomization when spraying, it lets you get very subtle fades. So far it has been durable and reliable. Cleaning is a pain, but that's all airbrushes.
Before the Iwata I had two different Testors air brushes. Don't bother with them. They're flimsy, unreliable, not adjustable, and parts are stupidly expensive for the quality you get. I had a dual-action side feed brush and a single action siphon feed. Both were terrible. I started using canned air and got varying results due to pressure fluxuations and mentioned above. If you do use canned air putting the can in a large basin of hot-to-warm water helps keep the pressure consistent.
For a while I would hook up to my little 3-gal Harbor Freight compressor. It's loud and has a hard time keeping up pressure, but it's better than the canned air was.
Nowadays I could probably just run a hose from the garage and let the 12gal compressor do it's thing downstairs, but I haven't had need of my airbrush in a while.
I don't use mine often, but when I do I'm glad I spent the money on a nicer one.
Agreed on that. The NEO is a decent airbrush for what it is; I like the Eclipse a little bit better. I've got a Badger Sotar 2020, an Iwata Eclipse, and a Paasche VL. I had also bought a Master airbrush compressor from TCP Global, which came with a cheap Master dual action airbrush, and my uncle gave me his Harbor Freight airbrush.
The Master? It broke while I was cleaning it - a piece that the cap threaded onto snapped off, and for me to replace it, the parts were as much as buying a replacement. The Harbor Freight one, the plating started to flake off after 2-3 cleanings (and why I suspect my uncle gave it to me - he couldn't get it to work for him, most likely due to the plating getting in to the nozzle). I've ditched them; it's not worth trying to get them to work for the headache I had with them. That said, if you just want a cheap airbrush that you're only going to use once or twice? It might be worth purchasing.
The Paasche VL is...Well, it's ok. It's a suction fed airbrush; I've never had good luck with them pulling liquid in. It might just be me; I dunno, but they're not my favorite. I also fought a bit with adjusting it for flow, so I kind of gave up on it.
The Iwata's a great airbrush for doing larger areas. It's kind of my "workhorse" brush; I can use it for larger areas and background color for things. Where it kind of falls down for me is when I start wanting to do detail; I fight with getting finer lines. It's not difficult, it's just not good for that.
That's where my Badger comes in. That thing will allow me to do very fine lines. It's more of a finesse brush for me, and it's got a great feel for the detail work, the more precise lines. But, it doesn't allow me to do larger coverage areas; it's got a smaller paint cup than the Iwata, and I just feel like it's not the right tool for larger sprays.