How effective is the laser treatment for freckles and blemishes?

I'm looking into laser treatments for freckles and blemishes, but I'm worried because I heard that I need to get them consistently.
I heard that freckles and blemishes don't disappear all at once, but rather fade gradually.
That’s why I think people say that managing freckles and blemishes is a long-term battle.
I've seen many reviews saying that laser toning brightens the skin tone, so I'm curious if you can definitely feel a difference on melasma and blemishes.
I would like to hear honest reviews from those who have received treatments for melasma and blemishes about how effective they were.