Oh poo. Original review was glowing, but over time I liked it less. And I wasn't using it every shower either and doubt it's keratin buildup.It's just not super soft, it's ok. My favorite is still Hairkop Obliphica. Check that out if you can. Also bottle is so damn hard to squeeze.
UPDATE: I'm so dumb. I thought I bought the treatment but I guess it was just the regular conditioner. (The bottles are different) I wasn't too impressed with this over time either and have the same complaints that others did; made my hair dry and a little brittle feeling. But I did eventually buy and like the reconstruct treatment and hydrator. I still really love the Hairkop I mentioned, but the Joico treatment is more intense. I wouldn't get this (plain conditioner) again. Original review is below.
HOLY HEALTHY HAIR BATMAN! I got this as a recommendation from the Hair color board I'm a member of, and they know their ish. Before dying, I washed my hair without conditioner and allowed it to dry so I could get the maximum intensity payoff from my color. It felt LIKE SHIT. I was kind of upset to see the integrity of my hair in reality, even though I knew I would condition after coloring. I dyed it, rinsed it, and put this on for a little while (could have been longer but I didn't want to risk pulling out any dye, though some say conditioning actually seals it in.) My hair feels AMAZING. I have other deep conditioners that I like and that are similar, but this is one of the best. Its like a different person from before I colored it. People have said you don't want to over use this conditioner, or any with keratin in it because it will cause buildup. But if you have some damage/dryness this is so worth trying. I got mine at TJ Maxx for a great deal and I also asked if I could return it if I didn't like it and she said it wouldn't be a problem. So no excuses. I also really like One 'n Only Brazilian Tech Deep Conditioner and Obliphica Nourishing Hair Mask (expensive but really nice!) My hair is also previously keratin treated, and it is recommended to add some back in with these kinds of products. Hope that helps!