Accent XL Vs Thermage for Facial Skin Tightening

I am 41 yrs old and have a small face with good volume, but have early jowls and loss of clear jaw line. I am keen to avoid surgery until later and wondered about Accent XL. Is it really effective and safe? How does it differ from Thermage? I have heard terrible horror stories about facial fat loss after Thermage, and therefore I want to make sure I do not end up looking worse!