I've taken a couple of courses a few years back, right after it started. It's the brainchild of Adam Nitti, my bass hero. If you're aware of him, he's one of the best players on this planet. His lessons are great, emphasizing economy of motion, seeking out and destroying bad habits, and generally training our brains to make our muscles work more efficiently.
The courses themselves will take some dedication if you want to get everything under your belt, depending on your current level of skill. Prices are reasonable, comparable to local private lessons. You're better off having 2-way communication via the web with pros guiding you than paying the same money to the 6 (total) fingered guitard guy rolling his own at your local music store who can spasmodically slap a bass with his good thumb.
Uhm, my apologies to injured bassists everywhere. Nothing personal meant. I'm among you. Anyway, I'd say MusicDojo would meet your goals very well. It's worth it if you're going to put in the required time. Just plan on daily practice instead of so much time many of us waste in noodling.
an amazing teacher and all round really nice guy. 
