They make Jets in 20', 30', 40' and 50' I believe. I run 30' jets and never let them out 100', I adjust accordingly. They're a tool, like dipsy's...lol
I would think the tadpole divers would be good up until you toss a deep diving crank on one..?
I use jet divers off of inline boards with shallow running (5' to 8') hard plastics for mid to late summer walleyes. I have no experience with the tadpoles, if that helps at all.