There were a few threads on here a long time ago about the Japanese thermal straightening. Most of the reviews I've heard on it were positive. You just need to find a legitimate technician with good references to take care of you. I'm certain the color of your hair doesn't have anything to do with how well the straightening will work, but the condition of your hair will. If your hair is very damaged from coloring/heat styling/whatever, a good tech won't let you go through with the process.
http://www.stripperweb.com/forum/showthread.php?t=28223
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