Just downloaded the 30 day trial! As someone who is always opening random "text edit" windows to take notes this seems like a pretty solid solution to keep things organized.
I like the premise but I really wish there was a "rendered" markdown view. I don't necessarily want to see markdown code in my notes but I don't mind using the shorthand to write the note. Colored text could be useful as well so maybe a rich text option for writing would be in order.