I am a plastic surgeon who performs both Exilis and surgical excision of extra skin. Exilis will tighten the skin somewhat. Although the newest version of Exilis (Exilis Ultra) helps even more than the previous versions it still has limitations. For those with gross excess skin after massive weight loss a tummy tuck (abdominoplasty) is the best way to treat this. For those with questions it is best to go to a practitioner who has both of these modalities available and therefore can pick the best treatment for you. Good luck.
Congratulations on your weigh loss. You should feel proud. It is possible that the only way to tighten your skin is for you to have a tummy tuck. I recommend that you have a consultation with a practitioner who performs Exilis and a plastic surgeon so that you know all of your options.