Powerful, but expensive and buggy
First of all, the app experience is quite pleasant. Making a mobile version of this type of app is tough.
However, few things are off. For starters, there are bugs: e.g. rotated objects such as text do not hold their orientation and revert back to 0° as soon as you either change its position or simply close and reopen your diagram. Second, the idea of syncing with WebDAV is so 1995 its not even funny. There is a better solution: DropBox and/or Google Drive.
I have to be harsh on my review because when you spend $50 on a mobile app, your expectations are obviously much higher. I expected little things like orientation actually sticking to be a non-issue. Fix the bugs, broaden the horizon, and Id give this a 5 star review.
jarrednicholls about
OmniGraffle 2