In its current form it is regularly producing crashes, for example when going back from the Player view to the playlist. But not only then.
Development progress seems to be very slow at the moment. Also the switch to CloudKit is still on the ToDo list. (Was already promised for March 2016.)
I love Downcast, but if there isn’t any progress soon I’ll have to look for something else.
ecdltf about Downcast, v2.9.16