I also have some of these on order (should be here today):

Type-A male to Type-C female adapter. These are not simple mechanical pass-through, but rather have chips and stuff inside to make them work better (apparently). I'll post more once I receive/play with them.

My WD15 dock has no USB-C ports, so I ordered those to compensate for that. They are used to convert Type-A USB ports into Type-C USB data/charging ports.