Seems okay
This came with no instructions, I figured out how it worked by trial and error.  I put the pillow around my neck, fastened the velcro in place, pumped up the pillows and used the wheel to lock the tube so air couldn't escape.  My physiotherapist recommended this for me to help with neck pain caused by herniated cervical discs.  Jury is still out so far.  I had migraines caused by muscle spasms for two days so I hope this helps.
Rating: 3 stars