Pretty bad to be honest, I don't want to put Soop Doggs cleaning to shame, but I have an inkling he wasn't as gentle as I am when cleaning (ie 2 buckets, running hose, and washmitt)
I think black just picks up swirl marks very easily, so unless you have the car perfectly clean beforehand, you'll inflict them back into the paintwork (plus I believe Astral Black is single stage, which means it marks easier)
I've got quite a few 'polishes' from Chemical Guys that remove swirls, I just tend to favour Poorboys for the initial work. However I would recommend any Chemical Guys product for removing swirls (assuming you are using a machine polisher). I think they have changed their range recently from the products I have, but anything from here would be good:
http://www.chemicalguysuk.com/category_s/24.htm
http://www.chemicalguysuk.com/category_s/4.htm