You really have to go out of your way if you want to use a bad concept mapping application for iOS. It's a pretty great time to be a mapping nerd.
MindNode 3.5 is out with a bunch of great features. Not only does it now support the grande phones, it's received some serious redesign for the pickers and controls. The Font options are just crazy in this version. There are so many fonts available (including downloadable options) that they added a search bar to find the one you want. Amazing work is being done in the class of iOS apps.