Most of my flights are 10-12 hours long, and staying comfortable is constant a struggle. Generally, I rest my feet on the bag under the seat in front of me. I recently tried out my Comfy Hanger on a couple shorter flights (3 hours each) and was pleasantly surprised by how much more comfortable I felt.
On one of the flights, I was seated in the middle seat. The footrest was completely unobtrusive to my surrounding passengers. The adjustable straps easily fit around the arms of the tray table of the seat in front of me. I kept the tray table up most of the time, and rested my feet flat with my knees bent.
For the return flight, I adjusted the length as one would adjust the strap on a backpack, and slid the footrest behind my calves, elevating my legs. It felt as if I were sitting in a recliner with my feet raised.
I highly recommend trying this product, as it makes a ride in coach feel like first class. Additionally, I am purchasing one for my mother to use when she flies. I washed the footrest and its carrying bag in the washing machine and let them air dry. Both remained in excellent condition.