It looks cool and its ability to balance itself is impressive. But the motor required to run the thing makes too much noise. With those things around, you can pretty much forget about stealth.

Also, those robots don't have arms. They can carry stuff on their backs, but live soldiers would have to load them up themselves. This would make it impossible to send one of these things out under fire to pick up some wounded marines.

But like I said, it's still some pretty impressive technology.