I've used it, it really did seem to make my hair stronger, it gave my hair the "hard" protein feeling, but loosened right up to silky smoothness once i applied a moisturizing conditioner upon rinsing, i also noticed that the under processed parts of my hair actually appeared "curly/wavy" when my hair was wet usually those parts of my hair are very frizzing and unmanageable; this really surprised me because no other product had ever done that for my hair, I would definitely purchase again if it wasn't so darn expensive, but if i had a little extra cash to spend, it is something i would indulge in buying.