My LO is 10.5 months. Occasionally, I've tried to give her juice b/c the doc recommended it for constipation. Thankfully, my dd doesn't like it at all!
I don't see any real value in juice except as a laxative. It is just sugar water. In fact, my doc said that instead of juice for constipation, I could give a bottle of water with a tbsp of dark Karo syrup (unrefined sugar) - said that it was essentially the same thing. My dd didn't like that either. She is a milk/water baby.