Well I'm not taken by HAD. I only have just the amount of stones I need to put a respectable edge on my razors. My stones will eventually be replaced with better quality I'm sure, but for now they do the job just fine. I have, as my finishing stone, a C12k (What does PHIG mean by the way?) that was (stupidly) ordered from Classic razor.com (I later found I could have got one cheaper locally). The C12k does a fine job on producing a smooth finished edge. I have never tried any other stones though, so my experience is simply that of someone who has the tools for the job, and just what is required to maintain those tools in working order.
Mick