I have some shell from them. I've some shell from Horween. I can't tell the difference because neither have been worn much yet. If there is a difference, I suspect I'll only notice it after a few years (they both get worn maybe twice a month each).
Here's a picture of the Meermin's after about a dozen wears.
Looking good for the most part even with the fears I have had.
If a dozen wears you have not noticed the color lightening that is probably a good sign.
Here an article from 2012 of how meermin was dealing with shell. This fellow's shell would lighen after 1 wear.
At the factory:
After a couple wears
After adding some color back:
Has any one with meermin shell experienced this?
I have a feeling meermin probably has a bettering dyeing process than in 2012 since I have not heard too many bad things about their shell since then.