Nope, the three of them basically use and teach the same memory techniques, maybe with their own personal slant on each, but in the end it's all the same. I was pleasantly surprised to see how different Memory Optimiser was, but I still like the other basic memory techniqes too.
Remembering formulae:
Let me guess, they told you to make pictures? Relate words to numbers and numbers to words? Put things in "rooms" in your mind (the Loci system)? They are pretty effective techniques, but do require practice to master and maintain.
