My double chin was so bad that I went to get Inmod. They say the longer the procedure, the better, but personally, it was so painful (feeling like dozens of needles were sucking in) that I was so glad it ended quickly.
They say that if your double chin appears to be fat, in-mode is suitable, and if it appears to be sagging, a different laser is suitable. This seems to be correct.
I've only received the first dose so far, but there's no change at all... I think I'll have to dual wield and go get the second and third doses.