I normally don't do a lot of these but.....
I've got two Grex airbrushes and I love them. Recently my nearly six year old Tritium GS started having problems with airflow after I released the trigger, couldn't resolve it on my own so I returned it to Grex for service. The packing and packing o-ring were worn so they were replaced and the airbrush was cleaned and refurbished....free of charge!
I would recommend Grex airbrushes solely on their performance but you throw in that kind of customer service and it's no-brainer!