Skiied it yesterday. It is agreat ski, if you're a great skiier. Not to yank my own chain, but this ski is for an expert skiier only.
Two of my friends, who are by definition advanced/expert skiiers, skiied this ski last week. They found the ski to be to stiff and very tempermental. One of them even commented that this ski is intimidating, and to be honest I was a little intimidated myself. Then I skiied it....
What a ski... If you want a ski that is sure-footed in most conditions, this is it. To be fair, I didn't get to try the Grizzly in deep powder, but I did ski it in boot deep snow. I also skiied in all other conditions from ice to chop, from windsift to groomed. This ski performed, and performed well. However, you have to be carrying high rates of speed for this beast to perform.
The top ski in my quiver is a Volkl Sumo. It will be the ski that I grab 9 out of 10 days. This is because I am lucky enough to ski fresh turns most of the time. If I buy the Grizzly, it will replace my old volkl G-4 as a hard pack/crud ski. I also ski a Gottama, and this will replace it as well.
I don't see the Grizzly being as versatile as the Mantra, but if you want to role with a quiver, this is great ski to carry along with a powder ski. Even though I tried this ski in some shallow powder, it's stiff shovel and heavy camber make me dought it's deep powder performance.
To finish, I think that this is going to be a popular ski next season because of cool looks. However, I think that a lot of people are going to buy this ski and be disappointed, as this ski isn't for the average skiier. If you're at the top of your game, you'll love the Grizzly.