Robert at Master Guitar Academy and Dolphin Street has some of those in a Strat. Check out his videos and reviews of those pickups. They sound really good to me. Pricey, but good.
Just a note - the poles aren't magnets. They're different alloys, depending on the sound they're going for. There are 2 or 6 magnets beneath the flatwork, depending on the line of pickup. I got a couple of these to put in my Parker, but they're as tall as a stacked single, so they don't fit in the thin body. Some exploded views: