They will however mine scrypt @ ~9w if run them on a linux machine with the gridseed cpuminer -- https://github.com/gridseed/usb-miner/tree/master/software/cpuminer

I had mine sitting on a table next to a GPU rig, got frustrated the setup on controller didnt work right for me, plugged the USB hub into the GPU rig, downloaded/compile cpminer, seems to work fine, stable so far around 300kh/unit.

I had one running off a single PS and put my KillaWatt on it and it showed 9.0 - 9.1w while mining scrypt and finding blocks.

I probably did something stupid/wrong on my the controller setup, will report back when / if I get it working.

With more of these out in the field and the code on github, I'd expect that someone will put together some decent, clean control software.  If you read some threads from other people selling, there are various issues with the speed, stability, and even malware with some of what people are getting.