Somewhere I read that this ink was exactly the same color as Emeraude de Chivor, minus the shimmer. I guess that set some slightly weird expectations, and it's not really true.
Yamadori is in fact much more blue than Emeraude de Chivor. Both are absolutely beautiful inks, but this is not the same thing.
From a sheen perspective, Emeraude de Chivor has a much stronger and more intense red sheen. I do most of my writing using an F tip, on Rhodia paper. Emeraude de Chivor's red sheen will pop bright red even with the F tip. Yamadori, on the other hand, doesn't sheen quite so easily. Its sheen is also significantly darker, so it's a more subtle thing. That may be good or bad depending on your use case.
What you get in exchange for the lower sheen is a super well-behaved ink. Dry time of maybe 5-10 seconds, as compared to sometimes 30-40 with Emeraude de Chivor. I've covered maybe 10 notebook pages at this point, and I noticed zero smudging and no ink spots on my hands. No way I would have gotten so lucky with Emeraude de Chivor.
One weird aspect of Yamadori is that it has a slight aroma. I don't find it to be offensive in any way, but I notice it. It's tough to describe, but vaguely medicinal, maybe. Kind of weird -- none of the other inks in my collection have a smell like that.
All in all this is a great choice for a slightly more interesting daily ink. I'm very happy to have purchased it and look forward to filling many more pages without getting my hands covered in ink.