I've used the First Class Sleeper on overnight flights from NY to Santiago on LAN and really liked it. I'm only 5'1", though. It's true, you must not over-inflate. However, on a trip last week to Munich, I never attempted to use it. The Lufthansa seats in coach felt too narrow to lay the thing out comfortably and when the person in the row in front reclined his seat, I was squashed and unable to scrunch down the way the instructions tell you to.