Things I liked:This pump is extremely well built. I like that it can be easily maintained if needed by the owner and parts are available. I found the pumping action smooth and easy. I expect this pump will outlast me. Things I would have changed:This pump is very solid and refined. Can't think of anything I would change. What others should know:I filled the tank of my Marauder for the first time from the light charge it came with and found it very easy. I took my time and filled to 3000 psi. Stopping for a full second at the end of the up and down stroke, the pump never even got warm. I kept checking the barrel and valve area but they just didn't heat up. Refills from 2000 to 3000 psi are quick (a few minutes) and easy.