Aw, you edited and I missed the original post.... Hate it when that happens.
Agreed, though; as soon as they can sit on their own, and especially when they start moving around via crawling/creeping, the swing starts getting dusty.
My littlest is almost 7 months and the only time we use it now is to provide her a bit of a different viewpoint than the bouncy seat or excersaucer. Usually she's on the floor (she's inches away from crawling, and *dang*, I forgot what a pain that is!! lol), but I don't like to have her there when the dog is in the house. She's still too little for me to feel comfortable with that, since our dog is around 100 lbs!