Man those reviews scare me since they still seem to have USB problems. Otherwise this is probably the best deal for multiple cherry MX switches.
They have claimed to have fixed the issue with the newer batch of keyboards. This is a quote from a Rosewill distributor that posts on a keyboard forum:
For RK9000 updated USB, you can check the serial number of the unit.
eg. serial number:
(product type) - (model) - (dateyear) - (serial)
those made in year 2012 have no usb issues
so the units with 0512 (may 2012) will have no such problem.
IDK if it is true or not, but the fix is a relatively easy one, plus as takhyon said with the good customer service or Newegg and Rosewill I wouldn't think getting it fixed/replaced if you got a bad one would be a problem.