I have a ReefBreed Photon V2 24" over my Fluval M90. The tank is 100% SPS and also houses a blue gig. I've had the blue gig under Kessils, halides, T5's, and LEDs. You can tell when its not getting enough light because it will start to either walk upwards, if possible, or start reaching. I've had this blue gig move or reach under T5's, Kessil A350, and a 250 watt radium. I have the it currently under the ReefBreeder Photon V2 on the edge of the light (24" light on a 35" tank), and it has not moved or reached. It is nice and compact on the sandbed with deep blue coloring.
All in all I'm very happy with mine and I only run about 70-75% during peak hours on a few of the channels. The programming is pretty simple, and there are six channels to play with. I have seen some gorgeous tanks under Radion, and I have had success with Kessils too, and hell I'm even considering putting Radions on my Fluval M90. But not because I am unhappy with the ReefBreeder but more so that I just like new toys!