I know these types of brushes get a bum wrap. Truth be told, I did a ton of really nice work with the Aztek brushes when they first came out. I was doing commercial illustration and design, and did literally 100's of layouts using them. They are different, they are quirky, but when you get to understand them, they can do what they are supposed to do. I picked up the GP100 because of the forward trigger lever, and pencil like grip. It can be used as either a fixed action, or a double action. Pressing down with the forefinger starts air, additional downward pressure will move the needle back, starting paint. It is in no way in the same league as the rOtring, and Conopois brushes, but the method of operation is certainly similar. This one was cracked at the air fitting when I received it, and as soon as hooked up to air, it would simply blow the fitting out of the body. I made an aluminum collar to squeeze everything back together so I could at least fool around with it. I also had to alter my normal MAC valve QC set up, as adding it directly to the back of the brush has the set up terribly unbalanced with the front of the brush constantly being pulled skyward by the weight at the back. I just purchased a second one for under $20 (new in case) and will be fooling around with them some more in the coming days.