Aztek & Iwata, questions...

Hi there. Now that my airbrush is wrong and can't find spare parts, I'm thinking of buy a new airbrush. At first, I thought on the Aztek top version airbrush, the one with removables fuzes, but a lot of people doesn't recommend it. Then, they recommend Iwata brand airbrushes. Why is that? Why is Aztek that bad?? Can anyone give a clear explanation of why is that???
Thanks for you all.
GREETINGS

here you go. everything you need to know about airbrushes.
http://www.automotiveforums.com/vbulletin/showthread.php?t=201005&highlight=airbrushes