I was looking at them too for an east-coast all mountain ski. They have the same sidecut as the old PEs and Extremes (which were awesome), but with a bit of rocker. I think they have an extruded base though (can someone confirm this?) which was the one thing I didn't like about the Extremes.
Are the K2 sight a good Investment? If you are a Decent skier that knows whats going on, yes.
If your planing to beat the shit out of in the park on rails, learning stuff, Buy something already used.
It's a price point ski so keep that in mind.
Hope this helps.