I can take a lot of lessons for $675, what's this guy doing that's worth that investment?
That's an interesting perspective. Conversely, for me, $675 is about 5 months of in-person lessons. Everyone's idea of value will differ.
I can tell you that the biggest thing I have seen so far in the courses is structure. He explains a concept, demonstrates the concept, and gives you "homework" for the following week of lessons (and imo, a week is not long enough to master what he offers on a weekly basis). One of the things I've hated about most instrument methods is the tendency to show you a lesson and leave you on your own to work out what and how to practice. The lessons from Joe Hubbard don't suffer from this problem. He gives you very explicit exercises, instructions on how to practice, and what value you're taking away from the lesson. For me, I honestly feel like this is the first time in several instruments where I am legitimately learning BASS, like it's becoming an extension of my being rather than something I "do".
I wish I could provide a sample lesson to just show you -- the materials, as presented, don't exist in other bass methods or online lessons that I have seen, including SBL, BB, and TB. That said, I simply prefer the Hubbard approach, which is adult-oriented, no-nonsense instruction.
The list of world-class musicians who've learned from Joe Hubbard is kind of astounding. Of course, we're not all Pino Palladino, but hey -- we can at least wade in the same pool where he built his chops.