[Travis McGee]

“Competing product” = Subwing.

Cost is over $300, and is inferior in every way to a balanced dive plane made from a scrap of plywood.

https://www.facebook.com/subwing?fref=ts

[CodeToad]

Anyone with a boat and clear water can enjoy this. Of course, it helps to have a rather nice steel cutter to do it. :) At 3 knots the fun never stops.

[PapaBear3625]

Cost is over $300, and is inferior in every way to a balanced dive plane made from a scrap of plywood.

I'm thinking you could make a mold and produce them from tough plastic for real cheap.