You mean the Testors Aztek line? I dont like them because they are made out of plastic and people have a bunch of problems with them. Testors offeres a lifetime parts replacement warranty and people use that a lot I hear. Stick with a good metal airbrush.
Check out the Iwata Revolution HP-CR I recomeneded. For $60 you cant go wrong. I love this one beacuse its so simple and straightforward and does a great job. Its a double action design but really easy to learn and use. The gravity feed design makes it spray better and clean up is much much faster.
You could also try the single action Paasche H, a bit simpler to use abut can still do a nice job.
I would avoid thec aztec line and the paasche VL. The VL is very rough and imprecise - I think the Paasche H is actually more useful.