Brake Bleeding Gadget

I have this MityVac Brake Bleeding Kit but have not used it. Has anyone use it and is it easy to use?

The Fluid Evacuator Brake Bleeding Accessory Kit is design for use with Mityvac Fluid Evacuators, P/Ns 07200, 07201, 07300 and 07400. It is provided standard with P/N 07300, but must be ordered separately for the other evacuators. The joining of these two MityvacŪ products produces a quick and easy method for one-person vacuum bleeding of hydraulic brake systems. This Kit includes a durable brass flow control valve and universal brake bleeding adapters that will fit most bleeder screws. SEE PHOTO.