This is very limited and requires that you have memorised markdown. OK, that isn't too difficult and if that was the onlt problem I'd be happy with it and give it 4 stars.
My real problem with this system is that the Android app requires that I go through 2-factor authentication *every time* I synchronise. Therefore it is not possible to make a quick note or refer quickly to a note made on another platform. I do not understand this decision, the Firefox extension doesn't do this and it is unnecessary - if you want to offer this as an *option* for the paranoid and those that can't make their phone as a whole secure, fine, but please don't force it on everyone all the time.