Normally, I despise it. I want that cum to be in my mouth on its way to my belly. Depending on the guy and the situation of the bj, sometimes a little squirt gets out ahead of time and hits my face - thats all part of the game and I can laugh at it. I just can't understand when a girl sucks a guy to near completion then closes her mouth tightly and lets him use her face as a target. I just don't get that.
But, to each her own! I don't like having my face shot at, but some girls just love it. Whatever.