On 4 July paid $91 for seat selection on a flight from HNL to LAX. Went with main cabin extra which says up to 6 extra inches. I do recall paying for the extra before and I didn't notice any difference. Anyway, the fee is described as Preferred Seat Upgrade. The upgrade language seems to have not been reimbursed for others. If it doesn't automatically get refunded I'm going to contact amex as it is a seat selection within same economy class. Figure others may be interested.

Edit: Posted a day early. My tracker has decreased so expect the fee to be reimbursed despite the seat upgrade wording.