I know a lot of people in the hard rock/metal category use Seymore Duncan's. I wouldn't call 99% of those people "pros'", though. A short list of the people who use/endorse Dimarzios': Al Di Meola, Ace Frehley, Frank Gambale, Paul Gilbert, Eric Johnson, Steve Morse, John Petrucci, Dweezil Zappa, Steve Vai, Alex Skolnick, Joe Satriani, Billy Sheehan, etc... those being the most famous "pros'".