Anyone tried Enfamil Next Step?

I've been getting all these coupons and brochures about Enfamil Next Step with Lipil for 9-24 months. I was considering putting my son on this, but I'm not exactly sure if I should. He has a bad spitting up problem, so I've had to put him on the Enfamil AR, which is thicker. Would he spit up more with this? Does Next Step come in a thicker formula like regular infant formula? What are the nutritional differences and why is it better than regular formula? Anyone that knows anything about it please tell me.