I used the Keratin product - but didn't follow directions to the Tee (see my post earlier). However, I have been using the leave in conditioner since I first used the treatment. At first I used it every day and it made my hair softer and less frizzy, but it didn't have any shape... I think it was too soft. So I cut back and use it 2x per week. Ultimately I don't think this product is the holy grail if you want to wear your hair curly or more natural. It seems to work really well when you flat iron (I can't say for sure but that's what it seems from other posts) and when you wear it naturally I'd say it cuts down frizz by 10-15% and softens hair but not much more. Again - my disclaimer is that I didn't do the flat iron party of the treatment.
"let us be grateful for those that make us happy; they are the charming gardners that make our souls blossom" -- Proust