I have just installed this on the back of our bike. Only done one ride so far but seems promising. Did several hard stops from 50mph and it worked very well. No discolouration of the disc, or warping and rubbing. With the avid rotors I had before one stop like that would turn it blue and the heat would make it warp and rub for some time afterwards.
It wasn't too hard to get the caliper to fit. Just had to strip it down and machine the groove about 1mm wider on the inboard side to accommodate the extra width of the disc.
Here are some pics. Excuse the extra length on the cable and surplus material on the caliper adapter. Haven't machined off the excess yet.