I have been using this app for about a year. I have never had a problem with it. The flight planning section is a bit confusing  but I got used to it. Its free  but after using it for only a few weeks  I sent them a donation  and I have done that several times. The charts  airport diagrams  etc  are very easy to update. I live in the Baltimore-Washington area  which is an incredibly difficult area to navigate  and very easy to get in trouble  if you breach the restricted areas. This app makes it much easier.
March 11 2017