Product review (4 stars): Works...sorta.
Does an okay job of dispensing fabric softner but it depends on your washer. If your washer spins while it drains the water and then stops to fill with rinse water your good. But if at any time it stops spinning and starts up again your softner is being lost down under the basket and pumped out with the water from the spin cycle. Not sure if there is a way around it other than a downy ball. Works best with a full load and normal cycle. Permanent press  or a small or medium load seems to just waste the softner.