I posted a topic on it recently with photo's. It won't help indented scars just hyperpigmentation. It made my indented scars look deeper (it was a temporary effect). They are still there and just as deep as before I used the machine.

You'll need subcision for those

I just got my PMD a little while ago, and I've liked it so far. It takes time to see any dramatic results, so I can't say that it has worked miracles on my face in just a few weeks, but I've seen lots of success stories, and I think it could help. So far for me, it has reduced the number of breakouts I've had. You'll just have to try whatever works for you, but I would say it is worth it.This is one of the videos that really helped me decide to take the plunge and try it out.