I've used the shampoo&cond a couple of times. I didn't get the 30-day treatment b/c my hair is just wavy (and curls and gets frizzy/poofed when it rains). It hasn't done anything though I like I said, I haven't used any of the other stuff. I thought about getting the masque, but I'm not happy with the shampoo and cond. It dried out my hair and even stripped out some of the henna. From what I've heard, keratin products can be used on hennaed hair with no interactions. I haven't noticed any straightening power at all. I think I'll keep using it awhile longer, but so far, I'm not a happy customer.