Yes I have seen some mention of that also.
Interesting I heard from Paragon there may be an issue with windows 7 and the newer usb 3.0 drivers - apparently fine recognising the drives - but speeds aren't what they might be.
I don't know anything more about it than that vague suggestion, and I don't have any usb 3.0 devices myself.
Sounds plausible, though.
I hear Macrium are also having problems with transfer speeds - particularly with WD usb 3 externals - not sure why that is - I think they might all be using the same Renesas drivers.