This leg rest turned my cheap seat experience into an above average ride.

Used this in a seat bought with miles (a bad seat).

As others have mentioned be conscious of pulling on the seat in front of you when adjusting you feet/legs in it and don't have your feet/legs in it when lowering your tray table or it could jerk the seat in front of you

Note: I have short legs 29" inseam... idk how this would work for someone with longer legs in the cheap seats but if you are

I flew Delta and had no problems using it on one of their new planes as well as on an older plane.

You can really feel the difference when using it as well as after