Well, there really isn't much you can do with USB 3.0 yet for starters. And people who still have laptops with ExpressCard slots don't strike me as the early adopter type. Oh, and then there is the AC adapter.
You see, in order to supply the full 900mA for each port you will need weigh yourself down with the optional AC adapter when out and about. Plus, the whole thing is so damned bulky in general that you are liable to break it sooner or later. At least StarTech is offering a lifetime warranty on it. Of course, with a product like this, StarTech probably won't be around long enough for you to get your $50 worth. [StarTech via EverythingUSB via Ubergizmo]