I have 4 Iwata airbrushes, and every single one of them are fantastic. My brushes are in constant use (just about every night), so I make sure they're clean.
Between colors, I spray Windex, but once I'm done for the evening, I'll break them down and clean them. Typically, I'll remove the needle, and run a cleaning brush through the insides, reassemble, and run Windex through one last time before wiping it down.
Considering the amount of money I've spent on my two high-end brushes, I've just made breaking them down each time part of the ritual, like shutting off the lights.
I've used (and owned) Badgers, Paasche, Aztek, and a Binks over the years, and I'm a hardcore dedicated fan of Iwata.
Jeff