Hi Guys, I'm not too familiar with those particular pickups: I haven't owned any myself, though I've played a few and loved them. From talking with Bill about it, I do know that he was tasked with building a higher-output set of pickups for the rock styles of the day, and that Gibson was really behind the project, giving it a fairly large budget and not tying his hands. They were trying to repair their damaged reputation, so they wanted the best pickup available. His assistant at Gibson was none other than Tom Holmes, so those pickups were made by 2 of the most legendary pickup makers of all time- pretty cool, huh? It was designed to be very versatile, so that it sounds great tapped, or out-of phase, or in parallel (for a low output 'bucker tone.) I know a lot of guys love these pickups, and they're becoming a bit collectible in their own right. I wish I knew more to tell you guys, but maybe someone else has the info?