I rode the 173 Shaman and 164 Nomad last season at Loveland on an overcast day where there was windbuff soft serve at the top, wind blown covered death cookies in the middle, and iced up moguls and moonscape down lower.
They handled like a dream in the soft serve.
They handled very skittishly on the moonscape and moguls. The Shamans, which have a massive shovel got caught up on ice and bumps. The Nomads are just plain jittery at speed on anything that's not soft.
As a dedicated powder plank only they are ripping.
But if you're looking for something wide that handles hardpack groomers (why, I can't imagine) you might want to ride them first.
I would suggest contacting Icelantic directly to see if/when/where they demo.
They are interesting skis and worth a looksee.
Also the founder, Ben, is really cool. I picked his brain when I demoed the skis AND he bought me a beer just for trying them.
But yeah, I'd suggest "try before you buy" as they are a distinct ride.