Nice find! I'm interested in the trend because I hear Black Arks eat DMTs for breakfast. Of course theres always SiC in 60, 90, 400 to seal the deal.
But a dan's black ark (sold relatively flat) lapped on a bulletproof diamond plate that goes up to a 1000, 200 laps afterwhich you take a beater razor too... cost is high but you have a better time lapping. Sounds like a good deal.
I got HAD hard today. I got so excited about arks my humble law-student budget just opened up (gee, wonder how that happened?)