I played with the trial version last night. What I can say right now is that it makes a quasi-JBOD where the disks can maintain their identity as an independent drives or be addressed as a unique volume. Drives that already have content merge into a single directory structure within the volume, and uninstalling the program is non-destructive to existing data. I didn't check the data duplication feature (I kind of don't care about that), but I did make a nice 18.5TB array using a mix of the WD drives and some 1.5TB Seagate and Samsung drives. If I wrote data to array members as their individual disks, that data showed up in the volume. If I wrote data to the volume, it showed up on the individual disk containing the parent folder. That makes sense.
I'm a little worried about all the data structure maintenance options in the program, but this looks like it might be a reliable way to use crappy green drives.