Whether United First is worth it depends largely on the length of your flight and your desire for convenience. For domestic routes, United First offers Premier Access, which gives you shorter lines for check-in and security, as well as priority boarding and two free checked bags. Onboard, you get a much wider, "recliner-style" seat with significantly more legroom and a deeper recline (though usually not a lie-flat bed). On flights over 900 miles, you'll receive a complimentary hot meal and free alcoholic beverages. If you find a "buy-up" offer for under $150 on a medium-haul flight, the baggage savings and comfort often make it a great deal. However, it's important to note that domestic First Class does not grant lounge access to the United Club. For transcontinental "Premium" routes (like EWR to LAX/SFO), United often uses planes with lie-flat Polaris-style seats, which are significantly more "worth it" for a 6-hour journey than the standard recliners found on shorter hops.