When I had a Halle Berry cut back in '95 I used the Fermodyl #619 in the glass tube. I LOVED it! I would rinse my shampoo, the break then tube and put it all through my hair, then wrap it and let it air dry while tied down with the neck strips. When it was dry, it would be sooooo soft and since it was layered and short, I just finger combed it and walked out the door.
My hair wasn't damaged then but I did abuse it because it was short anyway.
I stopped using it because I'm a product freak and everytime something new came out, I would buy it. Now that my hair is shoulder length and has it's thinning, breakage problems from time to time, I think I might pick up a tube or two (since I have more hair) and try it out again.
If I notice a change for the better or worse, I'll post it.