Here is a good source for reviews of fat skis. I like the Blister reviews.
I've used a variety of powder skis in the past and these skis have strengths and weaknesses for different conditions, terrain, and skiing style. I currently have the JJs and love them. Since I ski a bit of everything, I like a well rounded ski that is oriented more toward the PLAYFUL end of things. I also want a fat ski that will be at least decent on groomers, crud, bumps, etc, although the overall orientation is to be fun in powder whether in a bowl, chute or trees. Will probably pick up a pair of Atomic Automatics this year as it seems to be a balanced ski for what I want, but I'm also considering the Moment Bibby Pro. The JJs and soon the Automatics balance my quiver, which also includes the Bones. The Bones are really more of a hard charging open area ski that works well in a variety of conditions. I found the Bones to be great all-around-ski for me that does best skiing fast in open bowls, but also skis well in bumps, tress etc even though the latter is not the Bones forte. Had no issues with the bones in powder, but the JJs are more fun in deep snow.
Again, my advice is to honestly assess what your style of powder skiing is and where you will use the skis, and then focus on finding a ski that is a balance for your other skis AND how you want to ski.