Lührs Jensen makes them and I have tried them off and on for years but can't really understand how to make them work for me to catch king salmon.Normally I back bounce K16 plugs. Sometimes K15. Mostly K16. So I'm fishing in say 14 to 16 foot of water. Keeping the rods throbbing in the zone with 80 ft of line out. I figure I'm running just off the bottom. Kings see up and forward so I'm good and I catch fish like this just fine . Then I move to some 20 ft water I let out a little more line say 90 feet to change the scope of the line and go deeper sometimes 100 ft rarely more than that. I catch fish. But what could / would a 10 or 20 ft jet diver do for me that's not already happening . I'm trying to understand this all. So I can even catch more fish??