The Walker Bay boats are very interesting from a technical point of view too. They came about because the company that makes them has the world's largest injection molding machine. They were looking for other work they could do with it. They can pump them out in any volume the market could possibly bear, and they get cheaper and cheaper to make as the volume goes up! Cycle times are just a few minutes each, so they could probably do 300 a day! The mold would probably last a million shots or so.
With the requirements for a really big molding machine I think it could be a while before they have any competition.