Did not feel a thing, woke up there was some bruising but not more than I expected. Excellent treatment from the doctor and his staff. I had this combined with a lower eye lid surgery so the entire cost was around 5k and well worth it! If you decide to do a procedure it's worth it to combine at least one more as it saves on the cost of anesthesia.
I also liked the fact I didn't have to go to some cold hospital room, my Dr has a clinic at his office, it's an entire treatment center. The Dr also offered to do a touch up at no cost if I wished.
I really like what fat did, it was soft and besides filling out some flat areas also improved my skin texture. Another benefit was that the fat was taken from my inner thigh (like a mini liposuction)... it was my choice where to have the fat removed from.