I had several (can't remember exactly how much) vials of Restylane filler, mainly in my nasolabial folds (one side was a lot more "folded" than the other) and around the chin. The results were incredible -- evened out my face, just about eliminated the folds, and reduced jowels.
A year later I still have minimal folding. Mr Dr uses a full dental block so there was minimal pain, even he pushed and kneeded the stuff around to get the best results. I did feel like a squirrel storing food for the winter for about 2 days afterwards. Yes, I will do it again.