I very like the simplicity of the product, and their free tier is quite generous.
Mobile app UX could be better (looks like it's just the site packaged in an app).
The only organization system I’ve found that doesn’t make me choose when to make something a document, list, or item. I can just type everything in as I think of it, and make the structure organically as I go, as simply as pressing tab to indent.
Very simple to use, but lacking many of the bells and whistles of other products. The devs continue to work on it, but it’s slow going.