Is Premium Economy worth the extra money?
If you are on a domestic flight that isn’t cross country, it may not be. You need to check the seat arrangements and leg room before you upgrade. Go to www.seatguru.com to check.
If your flight is a long one or is an international one it may be worth investing in the extra room and amenities. Check the carrier to see what the cost is and weigh that against your comfort, seat size, and duration.