Longlasting,

The mistake that people make is assuming that they are all the same, or even "copies" of another unit. According to my research, and the information from a source in our factory, there are now over 1000 manufacturers of welding equipment in china. But there are several dozen that actually have the staying power, but they can't all be copies. There are a lot of differences in the machines. Some of them are very similar with other companies, no doubt, since the suppliers to the companies may be making individual components, or there may be several wholesalers importing these units from the same source. Most of these companies are importing from lower end companies in China as well. The prices reflect the difference in quality as well.