It is NOT the whole MBTA
This app is just for buses. Commuter Rail, subway and boats are NOT included. So DONT believe the title -- you arent getting the MBTA. The app description is unclear -- it talks about buses, but doesnt exclude other modes. But the title definitely implies all modes, so its very misleading.
Also, even for buses it is just so-so. There is no system map. If you are interested in going to a place and wonder what buses go near there you are out of luck with this app.
I gave it two stars because for the situation where you know your bus route and want to look at schedules, it seems to be pretty accurate.
Levo Dextro about
Pocket MBTA