I remember @JFallows was frustrated by DevonThink sync configuration before. Seems they just released update that allows for iCloud sync and is more straightforward to configure.
From the press release:
iCloud synchronization is the one-button solution our customers were looking for. Add the iCloud sync location in DEVONthink’s sync settings on all your devices, and check the databases you want to have synchronized. That’s it. No user name, password, or cryptic server address. It really can’t be easier
This means syncing material on the Mac between Tinderbox and DevonThink also means easy access on iOS.