Also note that there is no manual ajustment for the working pressure. When you attach the regulator to the cylinder, it automaticaly ajusts to whatever pressure it was designed for. This has its pros and cons.
Irvine California where this seller is, is close to the major import hub on the west coast from Asia. Asian products flood into there by the truckload every day, and its real easy for someone to get something like this and slap their name on it. Find out if there is any kind of warranty. Usually there is no warranty, nobody to return it to if something is wrong with it. Milwaukee and JBJ are probably made by the same chinese company, but they carry an American warranty, and are screened and tested before they are shipped.