Love, love, love these conditioners. Excellent for deep conditioning. I've used the Biotin, Keratin, and Jojoba ones and they're wonderful. The Jojoba one is my favorite, it's nice & thick. I have a Henna one in my stash I haven't gotten to use yet.
The Biotin I use first wash after relaxing, as it has both collagen & keratin. It has tingling peppermint oil too. I alternate between the Keratin and Jojoba ones for weekly conditioning on dry hair. (The Keratin one is thinner in consistency than the Jojoba.)
Whenever I see these conditioners at Marshalls or TJ Maxx I stock up (code for:clear the shelves)!!