I'm curious about filler satisfaction and duration!

I am considering filler injections because I am stressed every time I look in the mirror lately due to my appearance looking much older.

I became interested because I saw so many people around me getting filler treatments, but since it involves injecting directly into the face, the actual patients' experiences after the procedure
I am most curious about the level of satisfaction.
Everyone's perception may differ, but I wonder if everyone is satisfied with the noticeable changes, or if there were more disappointing aspects than expected.
I would like to know your honest review.
I am also curious about how much the duration varies depending on the area where the filler is injected.
I am concerned about how long the effects typically last, and whether the shape might become uneven or unnatural once the filler wears off after the maintenance period. Finally, given the wide variety of domestic and imported filler products, I would like to ask for advice from those with experience regarding whether there are significant differences in terms of duration and safety commensurate with the price difference.
I am really worried about my nasolabial folds, so I am considering getting fillers. For those of you who have had the procedure done, please share your experience and any precautions you may have regarding after the treatment!