I replaced the stock BB1 & BB2 in a 58 VOS LP with a set of these and was flat out amazed at the tonal change of that guitar. It wasn't a drastic night and day difference per se, but rather much more of a good thing that already existed in that guitar. The stock pups had good balance and decent note to note definition but didn't quite have the output and warmth that I prefer. The WLH have a much better EQ balance and are not as soft or mushy sounding in the low end like the BBs but instead have more of a tight "knock" to the lower frequencies. Playing the intro to Whole Lotta Love through a Marshall 100 watt plexi proved that these pups do live up to their namesake. From raunchy crunch to bell like cleans with a light compression, these pups are the Ace of spades. Don't be fooled by the term "high output" as these pups are not really that kind of beast. They are considered "vintage hot" but not something like a JB model. I tend to think of them as a set of PAFs after a couple of good belts. I can't imagine anyone being disappointed with these. Try them and you'll hear just about every 70's British rock band from that era.