I think all these container based DC solutions from HP/SUN/IBM...I would say you will be stuck in the box, and may not be able to think out side the box due to your limitations
It's good for a quick/rapid deployments, but on the other hand if business is small size or expansion is expected your growth may be hinder by it's physical limitations. On the other hand if the same amount of money is spent sensibly on planning and building a real DC, the result can be great.