The general public believes that you are un-able to ski powder with center mounted skis, they are wrong.
Although if you are going to be a heavy powder skier, than you may not want to center mount them, but put them for forward so you still have a good amount of tail.
I like Center Mount and found it different for the first few turns in Powder, but quickly adjusted and liked it much more. The tips tend to want to go under when at slow speeds in flat heavy areas, but when you put at a good speed is not any different than a regular mounted ski.