I purchased them about 3 months ago for my 150g mixed reef tank with all the whistles (controller, lunar, 99% complete, standard configuration) and they are amazing. For the same tank I needed to purchase at least 3 of the modular ones. Way to expensive.
With the LED's there is no heat. My chiller don't even turn on. With my inverter air conditioning my tank temperature is at 77.7 in the morning when I wake up and after 10 hours of LED the temperature goes to 79.1. So know I have my Artica chiller as my main digital thermometer.
Dimming is also great. I started at 50% and went up gradually to 68. No more. Also I keep the manual dimmer on the actinics at 100% and the white down at 75% in order to have a more bluish look to my tank. And no more MH bulbs. I sold my ballast the other day and I had 13 spare MH bulbs. I didn't even wanted to count how much money I spent on bulbs but that convinced my wife to agree with me. Well good luck and go for it. One more thing, support is great and they return the email in a timely manner.
PS> My electric bill went down $200. I live in Puerto Rico. Right now is at 86 degrees outside.