Why would you want something heavier? To be faster you need to reduce drag,( aerodynamics), and power, (strength), be lighter, (body weight, or bike weight). Go with a combination of light weight and areodynamic. (SP)
If you already own the rev x set I'd say go with it. You could spend big $$ on a new set and not really gain much. If you don't own the rev x set I wouldn't buy it unless it was really a bargain.