I generally have issues with this ingredient, but I've found that, as with anything, formulation makes a huge difference. As long as there are lots of moisturizing ingredients it's not too bad. I believe it's in my AG Curl Activating Shampoo and hasn't given me any issues, but I beyond hated it when I used Kinky Curly Come Clean.

Modified CG since 11/5/11
CLEANSE: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo, CHS Treatment Shampoo
RO: DevaCare One Condition, SS Caitlin's Conditioner, Mop Top Daily Conditioner
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier and Strong Hold Mousse, Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel