The Aztek brushes generally work very well, when they work.
By and large most complaints you hear about them are not about the quality of work they do but that normally they stop working properly. Yes, normally.
Before anyone jumps on the soap box proclaiming their Aztek has been working perfectly and without fail since Moby *** was a minnow, sure, I'll agree that every so often there has to be one that works for the user for years. But for every one user that has one that works there must be 50 that have trashed them and moved on.
People preach about how to care for them, take the nozzles apart, don't take them apart, take the body apart, don't take it apart, store the nozzles in lacquer thinner, all kinds of stuff that usually contradicts someone else somewhere but all the while seeming to have identical results, an Aztek that works perfectly and is 20 years old.
A quick search (type in Aztek and grab a coffee) will find far more unhappy Aztek user threads than the other way around.
My first ab was the old Model Master Professional model (think that's what it was called), predecessor to the Aztek name, same technology. I learned how to mix paint and use an ab with it. In the end I too was doing camo on 72nd fighters freehand. Loved it. Easy to use and clean, never gave me problems.
Out of the blue one day it stopped working. Long story short, I tried all my tricks, cleaned and cleaned, eventually bought a new tan nozzle, the one I used the most. Fought with it for a couple of weeks, getting mixed results. Wouldn't spray paint then would spatter, then stop paint again. In the end I was so disgusted with it I tossed it gladly into the trash. At the time Testors had a lifetime warranty on the thing and you were supposed to send them in and be without the ab until they fixed it or returned a new one to you. I decided that if it didn't last any longer than a few months I didn't want to be bothered with it.
My uncle bought one within a week of mine, also his first ab. His lasted longer, nearly a year, then he had identical problems and gave up on his. We both bought Paache VL's and moved on. In the years past I've read hundreds of posts with people wanting help with a malfunctioning Aztek, and in those posts I've read what seems like hundreds of other people's responses saying they had problems, tossed it and moved on.
My advice to the OP is to do some research on the Aztek and look for positive comments before you commit to one. If you read more good than bad, go for it. Otherwise, if you want to skip the research and just buy an ab and get started, walk away from the Aztek. There are far to many good ab companies out there making products that have positive feed back, just pick one. 99% of them do as good or better work than the Aztek and 99.9% of them all last longer than the Aztek.