the two Billy Sheehan videos are pretty good IMHO-lots of helpful info and licks explained in detail/slowed down.
(that's if you can endure the appalling hairstyles and bleached jeans/spandex of Sheehan and Wolf Marshall

)
I'm not so happy about the Stu Hamm video I've got- "Deeper Inside the bass".
it does have licks slowed down , but I think it's better to have someone interview the player rather than them explain their playing themselves- Stu Hamm seems awkward, and the production quality is a bit poor as well.
it's also almost twice as expensive as each of the Sheehan ones.......