I have been playing 5 years, staring with ASA's that are impossible to get a tank off to many on/off with rails and drops. Some would hold pressure (smart parts) making it very hard to get a tank off. Some are almost impossible to turn the knob. Others look goofy, are large. leak, knobs fall off. I tried this and it is the answer to my prayers. Buttery smooth to turn off and on and bleed pressure out when you turn it off. Very light and compact. Everything I was looking for in an ASA.