Great for travel
For a number of years I have had back and sciatic problems that are worsened by sitting on the horrible seats that most airlines have.  This has been a great addition to my carry-on and the amount of discomfort I experience is greatly reduced to almost none.  Previous reviews mention not putting in too much air, that is especially true in an airplane as the cushion will become more firm with elevation.  The construction seems good and I am now using this at my desk chair each day as well.  The one, very small, draw back is that the filler tube will often pop out and if it is in the front it can irritate my leg.
Rating: 5 stars