Bottom line right now is weight. They weigh a ton, especially for a company known for how lightweight their skis are. I like that they are thinking outside the box and I think they have a real good thing going with their design. I'm not convinced the execution is on target just yet but I'm sure they're not resting on their laurels either. I wouldn't be surprised to see them become the hottest thing around in 1-2 years.
That's my 1 cent, anyway, I could be wrong, I do not have personal experience with them but have spent some time shopping around and asking a lot of questions about them.