I've been using a Harder and Steenbeck Evolution dual for the last 4 years,it replaced my old Aztek single.The Evolution comes with a couple of different nozzles,a three-step airflow control and an adjustable paintflow.I can freehand camouflage with it,down to Luftwaffe mottle,or open it up for undercoating with the larger nozzle,so it's quite versatile.Easy to clean,the only niggle is the fragility of the needles,the tips bend quite easily and need to be treated with care-I now have 2 expensive superglue applicators by learning that the hard way.I must say,I am very tempted to grab one of Des"recommended ones to experiment with.HTH
Dave.