It's cool. I mean, interesting, uncommon, not too weird, general positive image.
I prefer it spelled
Bryony, because
Briony looks like it's said "
Bree-" instead of "Br(eye)."
I have a friend who has a friend named "Bree-o-nee" (I'm not sure how it's spelled), and that's okay, but Br(eye)-o-nee is cooler.
Bryony will never be a favorite of mine, though - it isn't quite the right shape to really grab my imagination. Maybe it's too Brian-y.
- mirfak