However, I find that by themselves I have less than a 25% success rate unless the faster is fairly loose and just has an F'd head. My typical method is heat first, then drill with the correct size Left hand bit, then use a screw extractor.
Attachment 419722
I have several different types of screw extractors, however, I seem to have the most success with the screw extraction pliers, when there is something to grab, When there isn't, I then like to use the Eazypower Bladed screw extractor bits. They just seem to grab better than the various spiral styles.