Went on a 757 a few years ago from Chicago to Seattle and it was awful. Really tatty, brown old United Style seats, poor service.
This must have been quite a few years ago then, as I’ve been flying UA consistantly since 1995, and they never had brown seats, even in their previous all white livery, and I’ve flown on all their types. Even the old grey seats without the adjustable headrests were decent.