It will be interesting to see how it performs with the power limitations of USB. Worth a keeping an eye out for any similar implementations at a more reaslistic price if it proves successful. I'd consider a more realistic price to be in the region of €100 (looking at techno's costs for singles).
When overclocked, it uses more than 500 mA, so it can't be powered from a standard USB 2.0 connector. You need USB 3.0, or special hub with external power.
It can be underclocked, though, and I've seen mine do about 4GH/sec on a 500 mA budget.