I resisted the 11A/K phenomenon for a while, because I usually like to be seated mid cabin so that there is a feeling of a high ceiling and "roomyness", as opposed to feeling like you are boxed in by the bulkhead wall. It was on of the SIN-IAH sector that a very kind flight attendant convinced me I should try 11K. It definitely has its pluses, especially for flights when I would be awake a good amount of time, because you can lounge in slightly more comfortable position with that ottoman in front of you.