I think the family that runs the Steele, AL DragStrip owns the Promaxx company. They are good people. I've not personally ran any of their products. But from what I've seen they are a good value.
Monte Smith the nitrous guru that passed away years ago had nothing but good things to say about the owner and the ProMax company. He was a very nice guy to talk to and he treated you like a friend he was going to have a beer with Friday night.