I have a P245 with 58/15. As compared to the SC245 pickups that came in my 2008 SC245, I like the 58/15 more. A bit more complex tone, and decent output. Definitely lots of frequency content. I found the 245 pickups to be quite anemic and uninspiring.
I replaced the 245 pickups with BKP Cold Sweats, which I REALLY like. They even out the mid-emphasis of the mahogany SC, plus add some great bite, while still cleaning up well when rolled back. They are tight with overdrive, so you can use them for hard rock as well as blues. I also put a set in an SC (25" scale).
Compared to the Cold Sweats, the 58/15 are more complex and less tight. They are also quite clear, and seem a lot more responsive to playing and volume control. So I would say that I like them, but am struggling a bit with the complexity at higher gains as it can be a bit muddy. Jury is still out for me based on the styles I play, but definitely a big upgrade from many other pickups.