Yes I have. I timidly asked for a few and they sent me 14!
So far, I have only tested the colours with a dip pen and found them to be very vibrant, but they tend to feather and bleedthrough. The Umber is the first to go inside a fountain pen. The flow is excellent. Given it's an EF nib, the feathering is not very obvious. There is still a bit of bleedthrough though.
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