My wife and I (we are both in our 70s) have been using the Sleeper for a couple of years, and have found it to be useful. To a large extent, the usefulness depends on the airline and its seat configuration.

It is quite easy to inflate, the thing you blow into is long enough and conveniently located. You can easily inflate it or partially deflate it with little trouble.

You can easily slide it down so that it does not stick above your headrest and bother the person behind you.

You don't have to inflate it fully, just enough so that it "molds" itself to your body, and therefore takes up very little space.

Dick in the Boston area