I have the Japanese Thermal Reconditioning Straghtening done every 4 months, and it has changed my world. I had extremely thick, coarse, very curly, frizzy hair, but with this straightener it is much more manageable. The roots grow in curly, but the rest stays straight and relatively smooth until it is cut off (it doesn't look weird because I flat-iron the roots and smooth out the rest of it too). It doesn't wear off, so if you do it, you need to be sure you want it. I still have to flat iron mine, but people who have less unruly hair to start with don't have to flat iron it. It is much easier for me to flat iron it now, and it stays smooth until I wash it (it's so coarse, I only wash it twice a week). From what I understand, prices vary across the country, but I paid $300 the first time I had it done 3 years ago, and I pay about $150 every 4-5 months for touch-ups (where the roots grow out). I will never go curly again. You can still color your hair with this product, but highlighting isn't recommended. I have very strong, healthy hair, and I am able to highlight it without damaging it. It just depends on your hair. Good luck with your decision! :-)