My knee-jerk to the pricing was that it's too much. On the other hand, as a brain-storming idea-gathering space maybe I don't need more than 100 notes at a time -- once I'm done brainstorming I export and delete, I dunno.
By way of comparison, I have 1600 notes in Evernote including PDFs, images, presentations I'm working on, web-clipped articles and their contents, encrypted notes... and they're $99/year. I don't think Milanote is positioning itself as the "everything box" that Evernote is. If they are I'd love to see a roadmap to help me evaluate.
Please add an API for programmatically accessing notes and boards. I don't need the layout information necessarily, but how great to tag a note #todo and have some agent somewhere pick it up and start tracking it, or sync an entire board out as part of a build process to make a larger publication.