The Diesel Crew is legit. Smitty is an online aquaintance and a solid guy. He trained Tom Lawlor for his time on TUF. Tom now has an MMA school here in Orlando with Seth Petruzelli. Here is some of the training that they did.
You really can't go wrong with any of the Diesel stuff.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin