i demo-ed them at targhee yesterday, sick ski.  not a light set up but it charges super hard.  scrubbing speed through the trees was effortless, and crazy responsive.  im a smaller guy, 5'8 165 and all the had to demo was the 188. thats longer than i usually ride but because they new ski dimensions it did whatever i wanted it too.  handled fine on groomers.  comparing it to the JJ, it is a more all mountain ski but the JJ will be more playful and better for switch skiing/ladings in the powder.  theres a def shape difference in the tail of the 2 skis, S7 has alot more taper where the JJ is a more symmetrical set up.  for big mountain charging, go with the S7.  if you riding switch, doing alot of booters go with the JJ