yeh I have. Scarification in general, as well as branding. But branding especially is fairly unpredictable and depends a lot on your skin type. In the past my skin has not scarred much with either cuts or burns. I had a fairly large burn(cast iron plate, eh) on my upper arm about 3 years ago and for the first year it was really dark, but you cannot see it at all now. I have a few SI scars on my arms, but the amount of scars doesn't relate well to the amount of times they were cut up.
I'd love it if I could get something winding and ethnic on/around one of my forearms with the kind of look you see on lots of african tribes, but I doubt it would turn out that way. They use cutting + ash and african skin is not so similar to maltese/celtic whitey.
This girl's one you've posted looks fucking gorgeous, but not everyone's would turn out so nice and evenly.