I have a Fat Boy and a Slim Adjustable that I really want to like, but can't get as good of a shave as I can with my Mergress or Slant. I know some of the Aristocrats like the 66 are supposed to have a better build quality, but performance wise is there really a difference between a $150 Gillette and a $25 one? I'm guessing the value has more to do with the rarity and collectability.