I user the Wheeler 89 piece set. It has been fine, no breakage, but I haven't encountered a screw that needs the penetrating oil/heat/impact routine since I bought the set a couple of years ago. I wish Wheeler had used some of the blank space in the box so that I'd have space for a few bits I supplemented the set with from Brownells (they could have fit in a dozen more holes), and for the ones that need to be customized from time to time.