There are already a large number of long Worldwide Brands reviews on the Internet, so instead of talking just about what's good and bad about Worldwide Brands I'm going to briefly introduce it and then explain how to use it to find good quality suppliers from around the world.
Worldwide Brands is a directory of certified suppliers – both drop shippers and wholesalers – and that means that all of the sellers listed in their searchable directory are fully researched and guaranteed to be reliable. It's useful as well to have so many in one place – there are about 8,000 wholesalers and drop shippers and as of 2018, more than 16 million products listed in the Worldwide Brands database.
If you're looking for suppliers, particularly in the United States, then you're membership to Worldwide Brands will be very useful. Simply search by keyword for any product, supplier or category and you'll get a (long) list of them. Then you can winnow these results down by filtering them based on country, whether they are drop shippers or wholesalers and whether or not they supply in light bulk.
Finally, when you have found a few suppliers that look good, you can contact them directly – this enables you to start building a relationship and to cut out the middleman, potentially saving money too.