My hair is just 2C/3a (whatever you want to call it pics are at the www link) and my hair looks like crap straightened. You can tell my hair isn't naturally straight. It's sort of wiry looking when straightened and it won't stay straight.
Now my moms looks odd straightened but her hair is super thick and the strands are real thick.
2c/3a?
Low porosity, medium texture.
http://public.fotki.com/Medusahair/

If it smells good put it in your hair, if it tastes good spit it out!