I had the area right above my belly button done. It was uncomfortable at first and I felt like I couldn't get a good breath for the first few minutes. Then my body got used to it and there was no problem after that. I had no post-procedure pins and needles as others have said they experienced.
I have noticed a difference of about 25%, exactly what they promised. I am very happy with the results. I also had below my belly button done; same easy experience and same results. I would love to have some more areas done!