There are so many varients, knockoffs and copycats of these units, its hard to find the "genuine" ones, that may actually care about product quality. Most of them compete to see how many components they can leave off and still function like the others, long enough to have you accept delivery of a "working" fire hazard. They even rip off logos from the more known models. The photos of the PCB inside gives it away if its genuine.
Those hot air stations can be extreemly sketchy for build quality, look for sales listing that actually show the real PCB and inside of the unit.. Signs of acceptable build quality are actually using locking connectors, instead of soldering under sized jumper wires between the Power supply and the PCB. The size of more valuable components like the transformer is a dead giveaway on how much they cut corners.. and if anything is hot glued inside, its not going to last.