I've found BSB to be one of the bluest blues I've ever used and it's has some nice properties, especially water resistant, that most blues do not have. I take field notes with one of my other hobbies and the ink's water resistance on a damp, drippy day is a big plus. It will stain pens and that is why I'll use it in a $25 Ahab and not in a $400 Duofold.
Just like the discussions of soaps, blades and all the stuff with wet shaving, inks and pens can become very personal and what works for me isn't necessarily going to work for the next guy.
Enjoy your pen and ink and enjoy your shave.