I recently had a Japanese Reconditioning (straightening) Treatment. The woman, who is Japanese and was trained in Japan, said that it would last up to a year and that I may need to come back in 6 months for upkeep on sections of newly grown hair, near the roots.
My hair is now pin straight and I don't have to blow it dry or flat iron after shampoo-ing. I love the way my hair feels. My hair shinier and softer than it has ever been.
I don't know what relaxing perms involve, but my stylist (who recommended the reconditioning treatment) said that the Japanese Reconditioning was not remotely as damaging. Also, flat ironing and blow drying on a daily basis is probablymore damaging on your hair.
Oh, and yeah, the technician working on my hair turned away a woman who walked in for consultation because she had processed/colored hair. She also said that she didn't recommend the treatment for people with fine hair.
Personally, I love my hair after the treatment and would recommend it to anyone interested.