It is working great. Only draws about 37W at idle with the fans running low.
I would love to be able to control the fan speeds based on drive temps as opposed to just leaving them at Heavy I/O via the IPMI all the time. But then I haven't figured out how to control the fan speed in my main X10 chassis either to be driven by disk temp as opposed to just going with one of the 4 IPMI fan speed settings.
There's an I2C connector and purchased a Supermicro 4-pin I2C cable to go between the CB3 and SAS2 backplane, but the connectors at the end of the cable were slightly too small. I'd love to be able to pick up temp from the backplane as that would be a lot closer to actual disk temp. I'll fiddle with that some more once I get further along with my overall setup.