Trying out DEVONthink To Go 3.0 on the iPad Mini, and really liking it! The previous version was okay but a pain to keep synchronised, no matter how I did so. With the new iCloud CloudKit option, I was able to synch all my databases from the Mac to the iPad in minutes rather than hours.
I know some folks are going to gripe about the subscription pricing, although I think both that and the one-time purchase price are pretty reasonable considering how useful DEVONthink is.
This will also give me impetus to increase my overall usage of DEVONthink as a knowledge and document storage and management system across all my devices.