I use it with great success, It doesnt work on all colour's as well as it works with yellows, reds, purples and greens, but overall it brings most colour to the front, and then supplementing things like iron and potassium to enhance blues and greens can be done.
BUT You first need to have a system that is ready to enhancew colour through trace element supplementation, if you dont have low nutrient levels your pushing it up hill. The zooxanthelle will drown out the natural pigment and not allow the natural colour of the coral to shine through, and therefore enhancement of that colour through trace elkement supplementation such as koralcolor will be pointless.
What are your nutrient Levels (nitrate and phosphate) Synodontis and Puffy#79?