merlin,
you're on a slipery slope here. if you don;t check yourself you'll be freezing pictures of yourself and praying to the mighty belt. no, only joking.
you're right though, i haven't heard them (the note pads)however i've heard many of the tweeks put forward in recent threads and have found very few of them to actually improve the sound in a meaningful way to my ears.
i consider myself to be like the psycic investigator james randi. i'm willing to believe that these things can make a big positive difference but i haven't heard one that has yet, in my system.
cheers
julian