I don't have experience with them but based on what I see on Twitter they are training some pro guys and they use some of the more modern bat path drills.
Looking at the drills they Posted some of them I would use too, doesn't look too bad.
The environment with some good players seems to be quite good too.
From what I have seen it seems that what he teaches won't ruin most hitters. That sounds not like a great compliment but imo knowing what not to teach is almost more important than what you do teach, I would cautiously do recommend them based on what I have seen.
I don't know of course how good the coaching there will be in person and whether you are going to work with him or an assistant.