I gotta be honest i've been riding JJ's this year in powder and i can't imagine people using them in park. They're way to wide and i'd imagine them getting in the way on rails or whatever. On the other hand, i've definitely been hitting backcountry feature and landing tricks with them so if you go in the park to practice tricks you later plan to use in the backcountry then sure, but i wouldn't use them as a primary park ski. Seems sort of wasted to be honest.