Overall, not recommended
Plus: plastic smell dissipates quickly;  hand pump fills chambers within 2 minutes, adjustable Velcro straps secure neck opening<br /><br />Minus: does not seem to provide vertical traction without impacting blood supply- at the point I felt the stretch, my head was pounding...<br />Also the unit leaks air even with valve closed.<br /><br />May be useful for sleeping whole upright, while travelling??<br /><br />I would not buy again.
Rating: 2 stars