I've heard mixed reviews on all the popular treatments. Thermage I hear is painful - some people say it works, others regret it. I've even heard some horror stories where women are left with permanent complications. Fraxel also mixed reviews. A lot of women claim the results are minor and not long lasting.
Quite frankly, I hear more negative than positive. But if you are planning on a treatment, then find the best physican you can and do not skimp out on the costs - you get what you pay for and this is your face we're talking about!