Excellent in many respects, and the best of the ones I looked at, but everything you input is only saved locally, so as far as I can tell there’s no way for two people to have access to the plans. You can send a copy to someone, but you can’t share access to a plan to make edits. Also, support link (both in app and in App Store) is broken. So great app for doing a project alone, but useless if two or more people are working on a project.