guys I am going to give you another bump here
I purchased two CG-locks, primarily for a winter safety course I got took this weekend.
I have to say, not only did the CG-locks keep my instructor and I stable during a spin. I felt it also helped me stay alert, upright, and in the correct seat position regardless of the bumps slides or spins. Not once did I feel like I was leaning on my left foot to keep my butt in the seat. The Cg-lock did all of that for me.