I had it done on my jawline and double chin, and there was almost no pain except when it touched my jawbone.
There was almost no swelling, and the effects seemed to appear on the same day or two, based on my own experience. The
first time I had it, the effects were good, so I had it three times over three months, but I'm not sure if it will last if you do it a lot.
Honestly, it seems like it was a waste of money because it will eventually become the same as time goes by.