I have been using it for almost 2 months now. I really like it but I use the entire system: shampoo, 2 min keratin, 2 min balancing moisturizer, and leave in. The balancing moisturizer is the key, IMO. You feel the softness of your hair after you use it. But I crave more moisture my hair drys (I wash 2x a week and air dry each time but blow dry 1x a month, ITH)
I think if you use the entire system, you should be okay. But that's just how I like to things. Oh and the balancing moisturizer is great with any shampoo and conditioner you use. I really like the system.
Now, I have the deep moisture shampoo and I will see how that works for me now.