I just tested this on one of my rigs. Worked OK, but my only gripe is that I can't set target temp higher than 80. I usually run my 290s at 89 to keep the fan speeds down - otherwise they're too loud.
How long does it take to show up on dashboard once you start hashing? Anybody tried a 7 GPU rig with this software (Z97 MB, MSI 470 4GB Armors)?