The keratin one absolutely did not straighten my curls. Instead, they shrunk up and perked up like they do with IAGirl's pt. It was almost pt time the first time I used it, and the ends of my hair were almost at bra strap length. First use brought the ends up to just below armpit length. It left my longer layer spiralling at the ends, and gave my shorter layer root curl and volume (something I typically have to work to get). My hair was super soft and shiny too.
CG since 11/2011
2c /3a F /Mii, low porosity

Spring Products /Routine:
Clarifying: Herbal Essences Tealightfully Clean
Low Poo: Renpure Luxurious Argan Oil
Co-washes: Suave Naturals Tropical Coconut or Daily Clarifying
RO:
Tresemme Expert Selection Perfectly (un)Done, Cure Care, Suave Tropical Coconut or Daily Clarifying
LI (if needed):V05 Kiwi Lime Squeeze, V05 Strawbery
Renpure Brazilian Keratin Straightening (old formula), Cure Care
Stylers: LALSG
PT: IAGirl's as needed