Since I began tearing down USB adapters, a clear trend has started to emerge: everything under $4 is garbage in my performance and safety testing, while products from about $10 and up are generally pretty good. Of course, the cheap units are generic, while the pricier ones come from known brands with a reputation to maintain, skewing my expectations somewhat.Today, we’re fleshing out the $10 category some more with the addition of Amazon’s house-brand CU23011W tap-adapter. In typical fashion, the CU23011W arrives in Amazon’s generic brown box with its black-on-white branding and description label doubling as the box’s seal. Inside, a secondary cardboard insert cradles the combo tap-adapter to prevent it from rattling around during shipping. Though basic, this does a fine job of moving products from factories, through the warehouses, and to your doorstep in good physical condition. How many accessories would you expect a (presumably) decent-quality and safe $10 adapter to ship with? The only thing included in the box, aside from the CU23011W itself, is a trilingual (English/Spanish/French) manual. The documentation predictably explains that the port with two lightning icons is ra...