Good review. I love the way bottled ink looks, but I'm a messy writer so I won't usually crack a bottle open on my own.
I'm surprised that the Edelstein ink has better water resistance. I once spilled Kujaku on my fingers, and it took more than a week of soaking and scrubbing to get the last trace off of my thumb!
I would expect the same thing! I really don't like inky fingers, and I once had an iroshizuku ink under my fingernail for four days after trying a friend's newly filled pen..