It's OK for broken stuff that is not seized too bad. I used it to get the male threads out from a broken el fitting on my plow cylinder, but forget it if you have to pound it in as it puts outward pressure on. The drill bits are nice.
Living in the rust belt and hating to deal with busted fasteners I have aquired just about every extractor out there, and they all have their place. Just have to use the right tool for the right situation, and it can get real bad if you do not and one breaks. I have never said, "damn, I wish I DID NOT have that extractor option"!