For those of you who have received forehead fillers, what is the biggest benefit?

My forehead usually looks a bit flat when viewed from the side, so I am considering getting forehead fillers. It doesn't bother me much from the front, but when I take photos or look at my profile, the line from my forehead to my nose looks a bit bland, which is subtly bothering me.

I looked it up and heard that the benefits of forehead fillers include making the face look a bit more three-dimensional and smoothing out the forehead line, which can make the overall impression look softer. I'm curious if you can actually feel those changes.

I find styles that look too obviously bulging burdensome, so I want just enough to slightly refine my hairline to look natural, like my natural face. I am also wondering if making my forehead look nicer when I sweep my bangs back or making my profile look a bit more natural are benefits of forehead fillers.

I would appreciate it if those who have actually received the treatment could tell me what aspects they were most satisfied with, and how much should be injected for a natural look the first time. I am also curious about how long the swelling and bruising last after the procedure.