I havent skied the jeffery but have skied the JJ. The JJ is a great Pow-tree ski. If your skiing fresh powder, espically in the trees you will love that ski for all it's worth. It proably has a good swing weight as it was really easy to control in the trees. Now if you want to ski the chop or massive hig speed lines look else where.
I do own the Billy goat from ON3P and have nothing but good things to say about it.
Luke Perin on the Jeffrey from ON3P Skis on Vimeo.
Luke Perin + Friends January Montage from ON3P Skis on Vimeo.