I wish i would have gone aryytek too,I’m thinking , being that Extreme Big Bore and the warranty to my booster are dying,although ,this thing will most likely work fine for a long time especially given how little I have to work it.They tell me if you dont use a shop compressor and just use your N2 to drive booster,it eats up ALOT MORE gas.I may order an Arrytek booster still just to have a back up.These things are amazing if you’re either shoooting big bores or else shooting small bores with N2 like me.The idea of ordering these pumps in the USA is appealing to me.But Extreme Big Bore was up for sale ,other than that their booster dies.Altaros has been around for a minute and they say have excellent service( but in Czech Republic) and are aboutnthe same price as the one you’re getting.The one I have cost about what the Maddogg stock pump costs by the time I bought extra whips and gages. Its a pain in the but to hook up shop compressor and booster just to fill rifles,but its soooo fast and efficient its crazy.Those Nitrogen cylinders are heavy when the time comesMan,those things are a ball bust.This 494 cu ft steel cylinder is a total ball bust