I did some very limited testing about a year ago, the Epson P600 was fresh on the market, and Epson made big claims about the much higher Dmax of their new black ink. I was using some3rd party ink, bought a photo black P600 cartridge , tapped the black ink and printed some patch sheets and made a new profile. I got at that time as well the black ink of a new P600 refill ink set by Lyson and tested that as well. I got this - my previous black gave me an L=8 on a particular paper, the Epson P600 black was L=4, and the Lyson black was L=5, that's variances you directly see in printouts - a drop from L=8 to L=4 is one f-stop additional latitude in photographic terms, and that is directly visible. I did not test all that on many papers which I don't use with pigment inks, but for me this new black made a difference. You need to run new profiles because otherwise the levelling off by the blackpoint compensation starts at the wrong black level. I could assume that this Vermont black would have a similar performance, but you need to test that in your printing environment - papers - profiles , and you may get to other findings with other papers. I have done quite some tests with inks, you need to take general claims about ink performance very cautiously, some are just small and measurable but not visible at the end in a printout.