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.

3a/f/iii
Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel