I've had the wool dryer balls for a few weeks now. I do a ton of laundry! The clothes, diapers, sheets, towels, etc have turned out fluffy and soft and seem to dry faster. I've been having trouble with the dryer leaving things damp at the end of the cycle, but since getting these balls in there, that hasn't happened once. Even with my large king sized bedding, which usually gets all knotted up. I think they do a great job speeding up drying time by keeping things moving. Love them, and love how soft they are. Super happy with the purchase!