Hi William
I have purposely steered clear of iCloud for a number of reasons. For simple apps: calendars, recipes, to-dos - the iCloud API is great. It starts to fall short, though, for complex database structures like Roastmaster. The developer forums are full of iCloud nightmare stories. I know from my own experience, even Apple's own apps crash most of the time when they are propagating iCloud changes after being in the background (Photos and iTunes being the big problem). SO, that's still in the "future" category - sorry.
The existing version lets you export/import databases via a few different means - DropBox being the easiest. You can then, on the target device, import that replacing the current database. The coming update (now in beta) fully supports AirDrop, so that process gets even easier. You can do all of this right from the home screen - 3 taps to invoke the export, one to hit the appropriate button, and another to choose the target AirDrop device. Then, on the receiving device, one tap to OK it, and 2 taps to verify you about to replace the current database.
No, not iCloud simplicity, but better IMO that folks having years worth of roasting go corrupt because of an iCloud glitch. BTW - the update fully supports the iPhone 6 - so you'll get some extra screen real estate too.
Space? My current live database has 820 roasts, and 46,448 nodes - and it weighs in at 2.8 MB. Roastmaster databases are relatively small and fairly streamlined. You'd have to do hard core roasting to ever see a space problem.
About the probes... I used High Temp HVAC foil tape around the base of the probes to function as a "stop", so I can quickly insert them to the right depth and know I won't ever hit the tines.
Hope this helps,
Danny