Unreliable
Recently I have has issues with apps not updating. The only way to fix is to submit a new build, which is a long process due to Apples buggy developer tools.
As a developer, there is no way to manage testing with this app. And no, the iTunes Connect app does not do this either. The iTunes Connect website doesnt function correctly on an iPhone, so that doesnt work either.
Molanda Zu about TestFlight