This is a great device and does exactly what it says it will. You have to work to use it for more than a few minutes. I was in terrible pain and would see my chiropractor twice a week for relief. After receiving this Model 1400-D Posture Pump and using it for as long as possible, my pain subsided and I was able to go two weeks without an adjustment. My chiropractor noticed a big difference in how well my neck stayed aligned. Some reviews state that this device was "cheap", ignore these comments as these people simply don't know anything about materials or manufacturing, looks have nothing to do with quality. The main frame of this thing is NOT plastic, it's some type of injection molded fiberglass. The fiber strands form a much stronger framework than any "plastic". This construction method allows the device to be both strong and light. Once the huge cost of tooling is acquired, frames can be mass-produced at a lower cost than metal, and the lighter weight reduces shipping costs. The pump, airbags and exhaust valves are very good quality parts. Someone who does not understand materials and manufacturing processes will not have the knowledge or experience to understand what materials were used and/or why. I have been working as a process engineer for 15 years and designing electromechanical products. I can't find anything wrong with the quality of this device, it is well made and the most important parts are by no means "cheap" or inferior. I love this product and will probably buy the low back version in the near future.
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