Jslick, welcome to FlyerTalk!
I'm 6'3" and for me it would be a no-brainer if I did at least one long-haul or even trans-con r/t flight with UA. To me, those few inches make all the difference between a comfortable flight and a miserable flight.
Of course, if you're not that tall, it probably doesn't matter to you. The service, food, etc. is the same as in E-.