I have been using TheBrain on PC and Android, mostly happily, for quite some time. I recently purchased an iPad Mini so I could have something nice and portable to update my Brain as I read on the train - only to find to my disappointment and bemusement that you have to be online to edit a Brain on iOS.
How on earth did offline editing not make it into your requirements capture, when it's in there for Android and the other platforms? Online only makes Brain for iOS worthless for anyone who lives outside a city, or in a city with underground transport.
When is this basic feature going to be added?