I haven't been able to get this to install. The installer gets to a point and freezes. Says, "Downloading files to cache." and the progress bar is stuck at about 20% and says "Preparing Gregorian." I have to shut down the iPhone (5S), restart, and remove the half-installed app.
I installed and nothing, then re-installed from Cydia (did not delete first), followed by another reboot and then it showed up. Subtle difference, but it is a nice upgrade. Now it's my homescreen calendar.
There's a few calandar apps that are miles better then the stock calandar features wise but I like the icon of the stock and other apps don't do what it does, plus stock does just about what I want it to do now.