I had to install the gauge with some teflon tape and then the quick connector at the gun end was a little loose and leaked once it got up to 2000 psi. Once I tightened that the pump worked well. I charged my Marauder from 2100 psi to 2900 psi in a little over 4 minutes including a couple short breaks and with 85 pumps. It was a work out but very manageable for a 57 year old guy. I suppose it could be difficult if you don't have much weight to put to it. It is an excellent shoulder work out though. The outer tube was warm after but not hot and there was a little oil around the base where the outer tube bottoms out while pumping.
The bad part is the horribly translated instructions that are almost worthless. As a mechanic I can sort of make them out but they try to explain how to oil the pump for maintenance but it is very unclear. There are several YouTube videos that show how to set them up and service them though so a little research will explain better.
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