Gulden is massive premined coin, every investors need to know this before investing. Acutally there may be dump by the dev team. IMO gulden is a good investment because they have the real adoption in the world, especially European countires.
No actually only in Nederlands. But yes it's used.
But at this moment, gulden issn't used a lot, and not really known or appreciated by the general public. Since 98% of the people in Holland don't really care.