The app works well if you are looking for standard train schedules. However, the app is not updated frequently. For example, even though it is currently July 2016 the maps have not been updated since December 2015. This is a major problem considering the tram network is completely different now that construction began in May 2016. Additionally, the app does not usually have live updates for delays. It would be wonderful if the app included live information, but unfortunately its quite slow to update when train schedule change day to day or even hour to hour.
Münchner88 about MVG Fahrinfo München, v5.0.1