Apparently I'm late to the party, as I've just been using PRDCSSEB (gotta love that "abbreviation"

) for the past few weeks, but it has very quickly become my favorite ink, eclipsing both PRDCSSB and PRAB. I don't even use any other inks now. My PR Chocolat and Aurora Black sit sadly by.
To me, its somewhere in the middle between Midnight Blues and DCSSB. Midnight blues, while gorgeous, is a bit too thick for my tastes. DCSSEB is a vibrant, deep, cobalt blue, but has a similar consistency to DCSSB.
Probably time for me to get a bunch of ink together and do a big lot sale in the marketplace, because PRDCSSEB pretty much has everything I'm looking for in an ink.