I was not paid to write this review. I am not a robot. I actually bought this because I fly transcons every so often and wanted to test this out in preparation for a transatlantic flight later on.I tested it out on a 3-hr Delta flight while seated on a window seat. For the most part, I was comfortable. I think I should have adjusted the footrest slightly higher, but even at the position it was at, it was better than just leaving your feet rest flat on the floor. There was definitely a difference after I decided to pack up the footrest prior to landing. That being said, I think I would have truly enjoyed this even more if I had booked Comfort+ as my legs were a bit cramped (then again, the configuration of the airplane is what made it cramped).First things first: it comes in a plastic zipper case which you can use instead of the actually carrying bag (I'll keep using it instead of the bag since it can protect against water and such).The footrest itself is easy to set up in an airplane:1. Open the tray table in front of you and buckle it so that once the table is closed, the footrest remains in place.2. Gently raise your feet and place them on the footrest (be considerate of the person in front of you; remember: you're both packed like sardines so don't make their experience worse).3. Relax and enjoy the flight! If you need to move your feet, do it gently so that the seat in front of you doesn't rock. I switched my legs from crossed to uncrossed to side and the seat barely nudged, all while enjoying my rest.Now, caveats:1. Not all airlines will allow this. Consult your airline to see if there will be any issues with this. Even if the airline doesn't allow it, the worst that can happen is that they ask you to take it down, but keep reading.2. Not all airplanes are capable of supporting this. Regional jets (CRJs, ERJs) have very little legroom, small tray tables, and very weak seats. You're better off going with the mainline jets (Airbus, Boeing). Besides, for the flight time of those jets, it's not even worth taking out.3. Not all seats can accommodate you. Don't get a bulkhead seat or one that has a seat way ahead of you. The footrest will not work.4. Not all remaining seats are the same. Airlines have to abide by safety regulations and exit row seats and aisle seats will be big no-nos. You're better off booking a window seat if you're on your own or a middle seat if someone you know is traveling in the window seat. You SHOULD NOT impede access to the aisle for anyone (that's how they'll ask you to take it down). Even if your entire party is seated next to you, never use this on an aisle seat.5. You're probably better off with nothing under the seat in front of you so you can take advantage of various positions (legs extended but still suspended being the best one). However, be considerate of others and if you have a handbag or backpack, place it there and leave the space overhead for carryons.Finally, not all airlines are made equally. Legacy carriers like American, Delta, and United offer Economy Plus cabins that have a bit more legroom and may make it more comfortable to use this. Budget airlines like Spirit have so little legroom that there is no way you'll enjoy this. If you're flying in first class, it's pointless since the tray table is under the armrest and there is plenty of leg space as it is (unless you're flying an intl. configuration in which case it truly is pointless to bring it out).