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Has anybody used them? Are their diagramming methods similar to Powerscore? I'm thinking about buying their book of solutions, so I'd just like some feedback before l make the purchase.

Thanks in advance.

I've purchased several of their game solutions, and they're quite different from PowerScore's.
I can't really say which is better. Each has its pros/cons, but I had difficulty adjusting to Cambridge's method/system of notations.