I agree to some extent as there are lots of reasons coral don't grow and water perameters are one of the MOST important factors. I'd like to see a test between T5, kessils, radions and MH conducted. Having said that, I've been in the hobby for 15 years and my water perameters were stable when I had kessils for 7 months. None of my coral grew fast but colored beautifully. I put an ATI 6 bulb across the tank with reef brites and got more growth in one month than I did with kessils in 7 months. Now, yes this is my experience but I really wanted to keep the kessils. I feel 7 months was a fair shot. I just can't justify putting them back on the tank with the growth I'm getting from the T5s now. Furthermore, I have a LFS that is really reef centered. He's got a bunch of shallow frag tanks set up with Kessils and several with ATI 8 bulb t5. Hands down the T5s are out performing the kessils in terms of growth. All the coral are beautiful and the tanks run off the same system and skimmer so the water perameters are the same. If I could get the same results under kessils I'd stick with them. They are sleek, shimmer is awsome, efficient and well built. But my results and many others haven't been as good as T5, metal halide or combo fixtures.... if money was no object I'd buy a new combination LED / T5 fixture...