I downloaded this app at the recommendation of my doctor and I am very impressed with how simple the user experience is, how polished it is and how thoughtful the developer is.
Security is at the forefront with all data being stored in your iCloud account, which is great not having to rely on a third-party non-Apple server. The only downside is your data doesnt sync across devices, however I just chose my iPhone as the only place I will use the app—a small sacrifice.
All in all, this is a well-developed and supported app that I highly recommend.
AppleFanCAN about DBT Diary Card & Skills Coach, v3.3