My opinion is the same as those already aired. Slabbing is all very well, but you're buying the coin not the slab. No doubt CGS are making good money out of it, and why not. I do find the 'best known' thing a bit odd though for common coins. If there are, for example, thousands and thousands of BU 1960s coins, how can one of them be classed as best known when it would be impossible to examine all of them. Surely hundreds and hundred of them are the same as 'best known', or better. I don't see how CGS have been going long enough to have examined the vast majority of certain coin types.