I am a power user of Paper, using it to write blog posts, using it to collaborate on content with clients for design and development projects, and using it to offer clients HOW TO documents on how to update their websites, etc... I love that it is a working document, so I don't have to keep providing clients of staff with new links.
Overall, I absolutely LOVE paper. I think it's fantastic, clean, not clunky. What I would like to see:
Get out of beta already, it terrifies me that you will close, and I don't want to go back to using Google docs or Evernote.
Offer an offline mode. I need to be able to rely on this offline occasionally.
Better organization when in file view. I feel like the information can be presentend differently so each file doesn't take so much space and I don't have to scroll so much to get to the files.
Wish it didn't default to Recent Folders, and instead just defaulted to ALL Folders.
If I make something Bold BELOW a heading, I don't want it to appear in the tick mark shortcuts. I think the only time something should appear in the tick mark shortcuts is when I have selected it as a heading.