Mine was full of luggage from other seats which did not have overhead locker space. (seatguru.com)
Only downside is the need to put bags in overhead lockers during take - off and landing. (seatguru.com)
The hand luggage items must be no larger than 56 x 45 x 25 cm, weigh no more than 23 kg and be light enough to be lifted into overhead lockers. (thetravelmagazine.net)