Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worthless

I bought this hub (two of them, in fact), lured by the promise of High-Speed USB ports and the fact that it was "powered." The only thing the plug adapter seems to power, however, is the light that tells you it's plugged in. The $5 cheap-o unit I had hoped to replace did a better job of maintaining connection with external drives (which constantly spin down/ramp up using this unit), and even my Wacom tablet refuses to connect through these overpriced pieces of Dlink. No smart phone -- from the iPhone 3GS to an ancient Android -- can be charged with this unit, and many devices just plain don't seem to connect at all (and those that do don't stay connected for long).Extremely disappointed.