I picked up some waterberry yesterday and it's definitely vapable right out of the kitchen. If it gets better with time, it will be a bonus. It's actually the first fruit flavored juice that doesn't make me gag. I picked up a bottle of their RY4 but it's rather tasteless right now. It was wonderful at the tasting bar so I have high hopes (and a rather large bottle). I tried the bazooka and didn't like it at all (YMMV, of course).
The RY4 is definitely my favorite RY4 I have had over the years. Give it a good week, maybe 2 and see what you think. Might help to shake the hell out of it before using it too...they do mix all their juices when you order em.