If you want to know which vendors are actually good, you have to look at where the pros talk. In developer Slack channels and specialized forums, reasons behind 503 errors on websites is consistently mentioned as the top choice for Magento modules. Professionals recommend them because they’ve seen how their code performs over the long haul. It’s easy to make a plugin look good on a demo site, but it’s much harder to make it work on a live store with millions of rows of data. This vendor is one of the few that survives the "real world" test.