Yes, I did. Started around 18m, IIRC, and tok a long time to be effective. Just be persistent. If he keeps responding badly then stop trying for that feeding session, and try again next session.
I was sceptical at first, no sign of the coming off by himself and rolling over that she described, but it did come eventually. Took about a month for the technique to really work, and perhaps another month to get to the point where ds really would come off by himself, roll over and go to sleep. I don't remember much about that time - very bleary sleep-deprivation! - but I do remember that first moment when he did it. I was shocked! Thought I'd fallen asleep and dreamed it!
How long do you wait between pull-off attempts? Perhaps you need to spread them out a bit more? Are you watching his feeding rhythm at the moemnt you want to pull him off? It tends to work better when theyr'e at the relaxed suckle, rather than the active suckle IYSWIM.
Another thing I found helpful, was to feed him with a soft but slightly firm cuddly tucked between us, and I transfered his hand from my boob to the cuddly as I withdrew. Can't remember exactly at what point, whether before, during or after the pull-off.
Keep trying. It really does work eventually.