For those wondering about the purpose of this app, for me its about the PDF handling. Aside from the convenience of having a single place for all my bus maps, this app performs some kind of processing of the PDF that allows the users to open large maps quickly and zoom in and move around without too much lag, especially on my devices.
It might be a niche app, especially if you dont reference a set of maps very often. I live in NYC and have bus maps for all boroughs and use them often. So this app is very handy for me.
PeachesNYC about Transit Maps