Rarely. I'm only 5' 7" so I never really find the domestic first class seats worth it. I paid OOP for first class JFK to SLC once as it was lie-flat non-Delta One and it got me the MQDs to get to Silver Medallion. Normally wouldn't do that. That said, there are times where paying for first class has been extremely lucrative.
Delta One Suites Airbus A350-900 Review [Shanghai to Los Angeles] Stephen Au Updated: June 4, 2023, 7:40am CDT. Edited by: Keri Stooksbury. Transferred 47,000 Amex points with a targeted 30% bonus to get enough miles. Spent $59 in taxes and fees. Confirmed the reservation on December 3, 2018 (308 days in advance)The short answer to this question is that youโll need to decide if itโs worth it based on your personal situation. First class can be a lot more costly than economy class, especially on 5fntS.