I've got one. I had redbugs over a year ago, treated one time, and haven't seen another since.
The method: Bayer Complete. That's right, this stuff:
http://www.walmart.com/ip/Bayer-Advanced-Complete-Insect-Killer-32oz/16778341After a lot of reading, I decided to try. I started with 1-2 pieces to make sure I wasn't going to kill anything. Everything was done outside the tank in cups. After monitoring and not seeing any negative effects on the coral, I decided to go for the big one. I pulled EVERY SINGLE ACRO in my 120g tank out, loaded every fitting cup, tub, pitcher, etc I could find. I mean I pulled every last bit of acro out, and even some other stuff that was close to an acro just to be sure. I caught my outbreak early on, but still had tons of the little buggers floating in the dip water.
I did this one time and one time only. I've read that people suspect that corals absorb just enough of the bayer to keep them toxic to the redbugs for a period of time - long enough to break their cycle. I spent 6 months looking at coral with a magnifying glass out of paranoia, but the tank was completely clean after that one complete dip.
I have since used nothing but Bayer as a coral dip. I dip everything in it, from deepwaters to zoas to LPS. Everything but clams. I've never lost a piece from it, and my tanks are all pest free. Nothing lives through that stuff, except the coral amazingly enough. On that note, rinse thoroughly before returning to the tank. After seeing all the crap this stuff kills, I make sure none gets in for the sake of my bio filtration and inverts!
I've never measured doses. Instead, I dose until the water is just milky enough that I can only see a silhouette of the coral. It doesn't take a whole lot to reach that point. Best of all, it's WAY cheaper than actual dips. I'm still on the same bottle I used to treat my outbreak. I think it cost around $15 or so?
Enjoy, and don't be scared! If it killed coral, I wouldn't have any.