I just got to Demo this years Summit split for the past month.
My general thoughts on it are that this is a "big mountain powder slayer". Without a doubt a great powder board. I had the 169 and it just rode a lot shorter. Great board. Neversummer has also lightened their core considerably. While maybe not the lightest out there, it is also not the heaviest by a long shot.
I do like the rocker camber design too. Great float that you'd expect with a rocker board. The camber doesn't really engage until you want it to. On a deep turn, that sort of thing. There when you need it. It also allows you to load the tail so you get good pop out of it. The Vario grip side cut doesn't hurt either, though I didn't ride all that much hard pack on it. A few spots here and there, no complaints. Overall it's a great ride that I'd take on pretty much any sort of conditions. If it's deep, it would be my stick of choice.