My Fury ran great all night and is rolling along at 1.56Mh using ipoMiner. I was getting lots of stale shares last night so I increased share difficulty to 256. That seems to have helped.
1.56MH is really nice for the Fury unit. What frequency are you running it at, and what is your ratio of hardware error / accepted shares?
Edit: Also, is this with or without the Zenminer?