I got my shots about 6 months after surgery. The first series was low dose and didn't help much. The second series was higher dose, and within a week the itching went away. By 4 weeks post, the scar collapsed. I'm now 6-8 weeks post second series. The area is still red, but slowly improving. I have a small indented area where the raised scar was before, but all the itching is gone.
I traded a red, raised, itchy scar for a red-but-fading, non-itchy, slightly collapsed area. I think it was a good trade, especially since my lingerie doesn't aggravate me all day anymore. The area should fade over time, and the collapsed area may fill in some, too. We'll see. It's not perfect, but I consider it a good trade. Maybe I'll get a camera and post a pic of my post-injection area one of these days. In my copious spare time (back to work, girl).