Since others are interested as well, I guess we could salvage this thing, so I'll post my opinion:
I think the overall design is nice, as is the price. Personally I think the one to have would be the 14 gallon. I don't think the 9 gallon has a lot to offer those of us who do 5gal batches.....a carboy does just fine and is cheaper. But for those moving up to 10gal batches, the 14gal model might be a cost-effective alternative to other fermenters of similar capacity.
As for the permeability issue, I don't really know as I've never secondaried in plastic. I would imagine, though, that as long as you were doing the standard 1-2 week secondary, it wouldn't be a big issue. But maybe for bigger beers requiring more time to mature, permeability might become more of a problem.
While I think they're neat, I don't see one replacing my tried-and-true carboys anytime soon. If down the road I decide to do 10gal batches, I might consider one.
My two pennies.