I'll come to King Slice on occassion for a delicious and massive slice of pizza. My choice? Arrabiatta for it's spiced, garlic-y sauce, and I'm not even into garlic.
The slices are enormous, so if you're thinking of getting two slices as one would at the usual suspects, don't.
Decent service. Worth a visit if you're in the area, but I wouldn't go out of my way to eat at King Slice.