I have the Hill-Rom vest. I strongly suggest you try any vest for at least a month before purchasing one. For me, it was minimally effective and a bother to use. What has really worked as an airway clearance for me is 3% hypertonic saline via nebulizer. It is inexpensive, relatively fast and easy to use. I use it twice a day and it really does a wonderful job of bringing up mucus. Best wishes!