Today I finally had a chance to install and try this program for the first time. A SAS drive that was mirroring at an average speed of under 500KB/s with ddrescue was going to take forever to complete. So, with nothing to lose, started the image with HDDSuperClone and it was able to copy 100% of the sectors after a few passes, all within 5 hours 44 minutes.
I plan to include it within a clone comparison test that I'm currently working on. But, from what I've seen, I'm impressed. To find out more about the program, you can find their website here.