I have used this app for a couple of years, and have generally been pleased with it. It has unique capabilities for a GIS package on an iPad, and has a lot of good GIS features. However, it is incredibly expensive, and it crashes fairly often. Right now it crashes every time I try to cash maps off-line. I am just about to go out into the field for a week, and a remote location without cell coverage. Im screwed. I paid something like $300 for this app, and I cant use it.