http://stackoverflow.com/questions/13831008/what-is-the-minimum-latency-of-usb-3-0https://stackoverflow.com/questions/13831008/what-is-the-minimum-latency-of-usb-3-0
Looks like USB 3.0 has a much lower latency than USB 2.0 and it would allow for things like playthrough recording. I'm guessing that the only thing holding things back is the money required to hire engineers to design equipment. ie. it probably costs less to hire engineers to copy someone else's design than to be earlier on the market, hence the high cost of the first usb 3.0 device.
There will probably be a USB 3.0 device under $500 within a year or two now that almost all new laptops come with usb 3.0.
