I have sagging cheeks and didnt want to have a facelift yet at a young age. The procedure was under sedation little pain but not extreme.
Pros: great alternative if you dont want surgery yet. Says it lasts around 3+ years (I'm in my 5th and although it sagged a bit it's not as it was). Downtime is very little.
Cons: The first days you look like overdone due to the swelling but it's gone after a week or so. You have to be careful to not move your face too much for a while. That's it. Overall totally worth it!!