Nice ink to use
Noodler's Green Marine is a very good ink. I wouldn't call it a "daily user" unless you adore green. Even so it has a very "normal" green colour, that doesn't scream at you, and if you did use if for personal correspondence it would still look fine (but don't use it in the office!). It's apparently been re-classified as "bulletproof" but, personally, I haven't found this to be the case. But it is very resistant to water once completely dry, and it doesn't have the nib creep that bulletproof inks sometimes suffer from. It's a nice ink to use. Great for writing horrible comments in the margins of student's work!