Hi Wayne,
For avoidance of doubt, my review by intent and design does not focus on any other chromogenic process. My discussion has two basic components: (1) a description of their process based on what they say it does just so people know what it's about, and (2) a comparison of their prints with the prints that come out of my Epson SC-P5000; why - because I was interested in seeing, and thought readers would be likewise - how the output from this process compares with output from one of the finest inkjet printers on the market - i.e. comparing two very different and capable technologies. I also think such a comparison could be of interest to all those who want prints but don't want to print, so would send their files out for processing say to a good quality C-print lab, or have their photos made into C-print books which these folks also do a lovely job of.
So when I say their prints are "convincing", what I mean is that if you look at them in isolation they really do like fine, and if you look at them compared with output from a first-rate inkjet printer, they still look fine. This is not only my opinion by the way - when I produce these comparisons I invite other pairs of experienced eyes to look-see before I submit for publication. Now of course, a sample of prints isn't a whole universe of prints, but a purpose-driven sample can tell a lot.
Comparing their chromogenic process with other chromogenic processes is also a valid exercise, but a whole other talk-show and fresh piece of quite time-consuming research - which I would welcome others to undertake if they're interested. :-)
I agree with you that the gamut looks relatively challenging in theory when you examine their profiles, as I showed in the article, but in practice it turned out to be less of a big deal than I expected; but because of the gamut difference, different editing under softproof with bespoke profiles is needed between say a Lumejet output and an Epson SC-P5000 output on luster paper; this is pretty standard when trying to produce approximately similar image appearance from technologies or materials that have very different gamut or contrast ratios. Now maybe a different set of prints would tell a different story, but between Kevin and I, we did have them print quite a few different kinds of photos, as well as some standard evaluation targets, and they all looked very good. Longevity isn't my wheelhouse, but I think the general consensus is that they won't endure as well as pigment inkjet.