If UA could replace every stupid 733/735 with an E70, I'd be thrilled. I've flown in 4B/4C several times, and have 3C on ORD-IND tonight. The only thing I'm a little concerned about for a longer flight is that there's no space to put a bag in front of 3C even after takeoff because of the aisle. I might actually prefer 3D for a longer flight.