Typically, United Airlines is not my first choice. I ended up flying United Airlines and this was my experience. I rarely sit in first class because I typically book my flights last minute and it is sold out by then. This time, I managed to book the first class last minute! I was not impressed. The seats and plane overall looked old! One of my armrests was broken.
My first class ticket included two free checked bags. I had an early morning flight and was asleep way before beverages were served (They did give me a pre-made bag when I woke up). Keep in mind, this is just MY experience. I do not fly United often so not sure if the majority of their planes are dated. Would I fly United again? Yes, but it would not be my first choice. It is worth it regardless, especially if you always fly first class or prefer more legroom.