The Minitaire stuff is truly excellent. First of all, from a sheer economic standpoint, the volume of paint you get, plus the fact you can get the stuff half off on Amazon (with shipping delays, yes) means that you're getting roughly 10-12x as much paint per dollar as compared to almost any other option.
For airbrushing, Minitaire is excellent. First of all, while I'm a fan of the model air paints, they don't have a great set of colors for wargames painting. They tend to have a lot of stuff appropriate for scale tanks and such. Minitaire has a wide range of colors across the entire spectrum. In addition, the paints are consistent in viscosity across the line. The same cannot be said for VMA (I've had to thin some of the colors dramatically). The Metallics leave a little to be desired, more like glitter+color (similar to GW paint) than the IMO far superior VMA metallics. The Ghost Tints are fantastic, a great new tool for doing various things (OSL, shading, blending, etc.). The varnishes are also excellent, the first ones I've had much luck with spraying.
If you want to check stuff out, I'm around on Thursdays.