They're one of Duncan's best kept secrets. I got my set by accident. I special ordered the Livewire II humbucker set. They sent the Strat set by mistake. I asked them, instead of sending these back, make me an offer I can't refuse. They let me have them at dealer cost. Best deal I ever got. I love these things.
And for the sake of the "rest of the story", (as the late, great Paul Harvey would say), I got a cool Candy Apple Roadhouse Strat from forum bro Butch S. He ripped out the EC tone circuit and made it passive. So it already had the factory battery box. It was a match made in heaven. Probably my favorite Strat. Although, my STK-S4 version is a close contender.