Doesn't work for me. My 6MH/s suddenly turned into 0.3MH/s no matter which frequency/pool I use or how many times I restart them. I strongly recommend that people do not upgrade at this time.
Which pool?
I've tried a few different pools now. It doesn't seem to be pool related. Interestingly, if I only have a couple miners plugged into each hub, it seems to work. I'm playing plugging/unplugging games right now to see how many I can get working at once. So far I can't get more than 4 working with a single controller/hub.
It's obviously pool related, we had no problems testing with 40+ units.