I truly enjoy Sherwood Green and your review is right on the spot. I've 2 colleagues in my office that have bought this ink the very same day they have seen it in one of my pens.
With Sherwood Green I've experienced some (not much) trouble in cleaning my pens. Cleaning a pen requires a little more time (a joy btw) than with other Diamine inks. Is this just me or did you share the same experience?
I didn't experience a problem cleaning out Sherwood Green from my pens, and I'm especially picky about inks not staining my converters, So I know it hasn't stained any of mine.
With C/C type pens, I use the ear bulb flush out method, and I don't remember having had a problem.