I've never seen a radiofrenquency system that equaled the overall results of a well done fractionated CO2 treatment with a good system (like Deka or the new Cynosure CO2).  BUT, if you are 30 years old or have no wrinkles or have minimal sun damage, you don't need the CO2.  If you just want a little tightening and your texture and color are good, use the radiofrenquency.  Dr. I