I have flown a zillion miles on the 757's of UA. Row 20,21 are some of the best in leg room in the fleet. FC sux. At 6'3.5" I always try to get row 6 so I can fully recline w/o encroaching on fellow passengers in F. Cramped row spacing in F. Many times I"ve opted to pass up the upgrade (58/58 so far this year) and sit in row 21C. Willing to sacrifice elbow room for leg room, every time. Love the power of this aircraft. Have been in some go arounds and it accelerates and climbs like no other. Hope UA upgrades. this plane is as tired as some of the old 777's