This is a small company, but huge on customer service. Joel, W3RFC, has been in the business decades and knows his products (mainly coax [all flavors incl HL], connectors & adapters, antenna wire, phillystran, and associated hardware). I would say that the RFC's biggest pluspoint is that they can advise, obtain, build, and ship to you what you need for your project. For example, Joel has made me up two custom (ferrite) chokes, complete with special lugs and waterproofing. Need advice on what is the best bang-for-the-buck regarding transmission lines, call the RFC.
73, Rich, K3VAT