Question) Is trapezius Botox really effective?

My shoulders tend to be very stiff, and perhaps because my trapezius muscles are well-developed, my neck looks short and my upper body looks thick, which is stressful.

So I'm looking into trapezius Botox, and when I read the reviews, I see a lot of people saying their necks look longer and their shoulder lines look prettier.

However, some people say the change wasn't as big as expected, and there are also stories that the effects wore off quickly, so I'm still thinking about it.

What I'm especially curious about is whether the line really changes noticeably.

The difference looks big in the photos, but I'm curious if people around you would actually notice it.

Has anyone tried trapezius Botox?