I'm not familiar with the Rusk line, but the L'Oreal extenso is our preferred chemical relaxer. The Extenso isn't made to make the hair completely straight, just soften the curl and smooth the cuticle to allow for easier blow out and/or flat ironing. The hair can still be diffused for a curly look. It is available in a sensitive(tinted) or regular formula, has a nice creamy consistancy that is easy to apply. The neutralizer requires 10 min and is applied twice. Home care products are available for maintenance.