I have a single black web ball in my SM. It actually adds to the challenge. I don't think its exceptionally more difficult to see if you have a well lit room, but it is enough so that you have to pay more attention to where it is - especially in multi-ball when it has a tendency to just "show up" at a flipper. If you play in a darker room, I can see where it'd be difficult to follow the black ball. Overall I like the extra variable it adds, and have had some of my best balls with the black on in play.