Caerulea fruit is edible, but not high quality. "Insipid" is the description I've seen most often, although I confess I've never tried any. I've seen several places that it makes a good substitute for blackberries in pie, and has a vaguely berry-like flavor once cooked.

For fresh eating, tho, incarnata, edulis and molissima are supposed to be far better.

Ya caerulea isn't the first thing I'd reach for.. Not even sure I'd try making it into something. I'd imagine it's like "what shall I do with all these elderberries?" They're just not that tasty. I'd go after edulis myself.