I had laser removal on underarms, forearms, bikini, lower legs, chin, upper lip. The underarms worked great. My hair there was super thick and coarse. Many pores had two or three hairs growing out of a single spot, so even after I just shaved, it looked as if I needed to again. It's been 10 years, and some hair has grown back, but it's soft, sparse, and light colored.
After my underarms, the laser place changed from laser to Intense Light Pulse, which isn't nearly as effective on me. I see some results, but not great. Basically just enough to make me look human rather than like an ape.
Scarring -- the only problem I had was on my arms. When you go for a treatment, the technician outlines sections of your skin with a white pencil. Before one of my sessions, I wanted to make sure that the technician got the WHOLE area, so I outlined it myself with a metallic gel pen. I don't know what I was thinking. She never touched the pen, but the heat and light pulses went through my skin and heated up the metallic ink that was inches away. The result was burns everywhere that I had inked. It really just looked as if someone took a dull knife and scratched my skin (heavily). It scabbed up pretty quickly and a few months later the scars went away.
I don't think I'd try anything on my face again. In the past few years, the pigment in my skin has stopped healing quickly, so even the slightest blemish takes months to return to normal color (if ever). So I'm getting blotchy and dark pigment from tiny abrasions. I can't imagine what would happen if I lasered now with my skin not recovering like it did 10 years ago.
One thing to point out. If you're going to do this, do it while your skin is youthful and it repairs itself. Also do it before your hair turns gray.