It definitely helped one scar a lot (so far--assuming it doesn't go down ;-). But the other scars have been more stubborn. But I am optimistic. Requires having it done more than once; Is expensive ($700 each time); So far (knock on wood), I don't think this has worsened any of my scars. I just had my 3rd round of subcision performed today. I see more scars than my derms seem to (want to) see (or treat!), and I do wish they would treat all of my scars, not just the most glaringly obvious. But the derm said to me today, "I can't treat something I can't see." I understand that, but it does depend on the lighting, and the uniform florescent doctors' offices' lights don't hit the face at that awful angle that brings out all the scars on the sides of the face.
So, if you can find a caring, experienced, patient dermatologist who is willing to spend time on and with you, who doesn't think you're being nit-picky when in fact you are the patient who is paying hundreds of dollars for the treatment, then I would recommend seeing that doctor. I have been to supposedly the "best", but since one gentleman pushed injections and the other treated all of my scars in less than 2 minutes flat, I think it's hard to know who to go to. I am making the rounds.