I really like Sparmax airbrushes. Have four to date of varying nozzle sizes. Great value. SP35, DH103, SP20 and my favorite Max 3. You need to thin Vallejo Model Air more when using - I use Vallejo Model Air with Vallejo Airbrush Improver approx. 1:1 due to the arid climate here. Tamya, MMP, Gunze, AK Real Colors, Ammo of MiG all work well (as they usually do with standard thinning ratios).
I like to hear about your experiences with Sparmax guns.