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this^, i put some sheap rossi bindings on my jon's and their amazingly light! and they worked fine on rails for me, im primarily a rail skier and i only had 2 minor edge cracks. id say amazing ski and great buy if you can get them somewhat cheap.
Don't use them on rails often, they're a jump ski, so the edges aren't able to hold up very well on rails and crack and pull out. They are extremely light, but that's because of the foam core, which can snap easily if you put too much abuse on it too. I would recommend you pick a different ski if your doing a lot of rails.