I also had trouble with CloudKit (and am in Europe). I use Dropbox and is is solid (in as far as it syncs everything correctly), though I do find it frustrating as the sync can take time if you have forgotten to click the cloud. I understand the mechanism, but would love it if DTTG could find a way to sync in the background and remove the need to be click so often on the cloud symbol.
I can’t use Bonjour as my iPad and MacBook are rarely open at the same time and usually in different rooms (so walking back to open the MacBook is also annoying).
I do love that I can display most document types in both and use DT and DTTG extensively for my work. If only the sync could be automatic - unless there is away to use Bonjour when my MacBook is asleep?