You should usually use ProfessionalMuscle's "search" function for any supplements you're thinking about or nutritional questions. The board is populated by professional bodybuilders, nutritionists, powerlifters, etc., several of which are famous or highly respected in the fitness community.
The comments by Dad in this thread are largely what make me skeptical of NO products: Any thoughts on naNO Vapor by Muscletech? - Professional Muscle
Although Ubermench's post re: NO Xplode seems to answer the question of how it would make it past the liver enzymes.