I usually want to sleep for a good part of the SAS ARN/CPH/OSL-US flights and more on the SAS US-ARN/CPH/OSL flights, so the weird quasi-upright lounging positions tend to be a somewhat lesser concern than how the seat assignment works for my sleep. I usually try to avoid paying for premium economy on my long-haul flights because I don’t find them so useful for my sleep that I would be willing to pay a substantial premium for them; and the price premium over economy class is often high enough for my travels that a discounted business class ticket may work better for me.