Ugh, we just started using the new Pari II I picked up a couple months ago as a spare and keep wondering, waiting for this one to do the same. Our original pari proneb was faulty from day one, but being new parents to a cfer we didn't KNOW that the meds shouldn't take that long. We have a devilbiss pulmoaid we used for our regular one, but now we have one in the family room by the xbox & vest and one in our room for when I do cpt on DS in the mornings.