Simply one is freezing the other 2, thermage and exilis is melting. But there lies a huge difference and benefit to melting with radio frequency. How long does coolsculpting take ? After freezing you need to wait 2 months for the dead cells to absorb to see whats left. Most people need at least 2 or even 3 coolsculpting sessions so you are waiting between four and six months. At that point after your coolsculpting treatments you will have more loose skin. So you will now need a different treatment like Thermage or Exilis to tighten your skin. Thats just not plain fair. Thermage, Exilis or any other radio frequency treatment takes a lot less time. Exilis is once a week for 6 weeks and the side effect is smoother tighter skin. Furthermore there are a number of side effects of freezing your skin that would require surgery to fix, written as a side effect on their own website.