1. It's easy to get lost in the index view if you have a lot of notes,
2. It crashed once when we shared a lot of images.
Anyway, overall it's an amazing tool!
The history of the project is a bit confusing though. Not sure if a name change will not confuse things even more. Though the new name sound better to me as well.
I'm so sad every time that restriction makes me fall back on Google Docs.
Probably the biggest perk Google Docs/Sheets/etc. has is that each app isn't beholden to develop it's own account and sharing model. A bunch of apps with very limited or non-existent security models can work really well when you put them into a larger platform that implements those things instead. Etherpad, EtherCalc, etc. are similarly awesome apps that kinda need outside help if you want secure sharing.
I've been using Mkdocs since which uses Markdown and that preserves text perfectly. The formatting is lacking a bit but I can put up with that for the benefit of knowing when I copy a command from a document to a command shell (and often running as root) it is going to be exactly the same as what I originally typed.
The major downside to me is lack of standardization. Things don;t always look the same depending on which Markdown renderer I'm using (editor built in, Github, Makocs etc.)
For instance, I find the redundancy built in to Markdown to be a misfeature--most Markdown editors don't distinguish between _this_ and this, even though the distinction between underlined and italic text is useful. Don't even get me started on all the different ways to create a heading and the headache it creates when parsing!
One feature request? When you highlight some text on the left it should highlight the corresponding text on the right, and vice versa.