The article is fine, so is the service. The only problem for people is that they don't want someone else FULLY being able to control their Bitcoins as they have ZERO access to the private keys while someone else has full access to them. Just to think about it for a second, you're putting all of your money up to be lost just to make a small 4 percent a year? I think people could live without this money to just feel safer by owning their keys.
On the side of the article though, it's good, keep pushing on blogging!