Feeling one's butt bones is both a good and disconcerting thing. At times you would swear you just sat on a small animal. Not comfortable, yet a small price to pay for feeling so much better in other ways. Congratulations on achieving the sore butt bones milestone.
Yeah, at times it feels like I'm sitting on rocks (or small animals, LoL!). Like you said, not very comfortable, but I guess it means my bottom side is shrinking, which is always a good thing.