What is the difference between Exilis RF and any other RF machine?

Hello and thank you for your question. 

Exilis uses mono-polar radio frequency
which is beneficial over other systems which use bi polar or Tripolar radio
frequency because it penetrates deeper into the tissue with no scattering of
energy (which can often happen with other devices). This means that the patient
gets 100% of the energy delivered to the target tissue, giving better, longer
lasting results that other systems.

Exilis also has something unique called
Energy Flow Control which means the machine constantly monitors  tissue
impedance, ensuring that the correct, safe and effective dose is delivered
without burning.  It makes for a very comfortable and effective treatment, tightening up the loose crepey skin on arms and thighs quickly and effectively with longer-lasting results.
You could also combine Exilis with x-Wave to accelerate and improve the results
We would briefly pre-treat with x-Wave for a few minutes prior to using Exilis
 to pull water to the .treatment area and soften the connective tissue.
This allows the radio frequency of the Exilis to penetrate more easily and heat
the collagen faster. Then use the x-Wave again post-treatment to provide
lymphatic drainage to the treatment area. 
Expect to have between 4-6
treatments, 1 week apart for best results, and schedule in a maintenance visit 6-9 months
after the end of the course. 
I do hope this is of help to you.