I've just been taking my first steps building an existing Juce application for Android. So far, I've been really impressed by how easy it's been. I spent a day twiddling with an app with more than 500K lines of code, and by the end of the day, it was running reasonably well on my HTC One.
One thing that came up though was that runModalLoop() doesn't seem to exist under Android, and I had to ifdef out all the calls to runModalLoop() out on Android. It seems reasonable to me that modal dialogs wouldn't work under Android given the way that Juce is hooked into Android, but I wanted to double check and be sure that this really is the case before I spend a few days rewriting a bunch of code to not use modal dialogs.