Look, Mario Sperry stuff is always good. Everything else, is just bullshit man.
He does a lot of nogi de la riva, has a pretty good intro to leg locks if you aren't familiar with them, some good ground/pound and mma guard passing, overall he makes a very strong showing for BJJ in an MMA/Vale Tudo context. If you can find them for sale, I'd say pull the trigger. You really can't ever go wrong with sperry.
Also, if you can't find them for sale, they're one of the few widely available videos, even on non-MMA/BJJ specialized sites. I've even seen his stuff streaming on japanese youtube equivalents.