After skating them for about an hour at the park I can say that they feel like spits, a tad softer than STF's and more grippy. Had no gripes with em and the slid well on smooth concrete.
Usually with brand new wheels I would never slide em with the threading still there but these held up fine. I had just flatspotted my 3 day old STF's powersliding at the same place so these PFCs are already preferable to Bones imo even though they aren't as speedy.
Spits are 100A, while PFCs are 101A (so a little harder)
I switched to a set of STFs for the reason that my spits flatspotted.
I think STF's are 103A. I don't remember the B-scale number, but I'm gonna guess 83B
It's definitely the hardest wheels that I know of
Anyways, skated the PFCs for a week or so. haven't powerslid any crazy shit, but it's good so far. As long as they don't flatspot, they're good in my eyes. I can't speak for the hardness apart from the numbers, maybe I'm just not that sensitive when it comes to the wheels. I think the one thing that makes PFCs so great is their price. Super cheap for something that's comparable to 25-30 dollar wheels.