I keep using it because it lays my cuticles down and I don't have frizziness and tangles especially when air drying when I put it in my DC mix. I wouldn't keep using the product if there wasn't an alternative way of using it.
It doesn't actually close the cuticle completely - it corrects it to the proper porosity so the cuticle isn't overly porous (open) and the DC and/or moisturizers penetrate and escape right out if that makes sense. So I when people say it closes the cuticle, its not completely closed. Good point.
Sally's had a buy one get one free sale on the Roux Fermodyl leave in treatment. I'd seen the product but never really gave it a second thought but I saw a lady with gorgeous hair who purchased all they had in stock except one box.... usually I don't do this but I decided to purchase it based on her hair (shame on me!) but I used it today and I'm loving the way my hair has turned out. I plan to continue using it but I was wondering how often I can safely use it which led me to this thread. Are there any updates out there???