I just finished 10hrs of coaching with Grayson over the last 2 months. Having some monetary success (winning a WCOOP 2nd chance and the Sunday Storm!) but also having a much better understanding of the game, specifically his teaching with 3betting preflop. Once I understood when and why to do this I found it very easy to exploit other regulars doing it.
Grayson clearly knows what he's doing and has great insight into the minds of all those aggro preflop regs