I have used it successfully a few times, and it is truly the last resort. The last time I used it was three years ago, and the soreness is almost gone. I joke, but only a little. I worked myself hard, and I would have just gave up if not for the fact there is a partially cut limb overhead. A buddy and me took turns, and then we decided he'd take one rope, and I'd take the other, and we'd saw together. We eventually got it done. It will most definitely work, but as I said...the last resort.
I never went up a ladder to mess with the chain. If I could have gotten to the chain, I would have taken a normal chainsaw to the limb.