I would get the United 24" E-175 seat independently confirmed. I was posting elsewhere today that the E-175 is a fantastic short-haul airplane, in part because the 1x2 config in F is quite roomy. But that's 3-4" wider than most F seats on E-175's on other airlines, or 9 to 12 inches of total aisle space unless United has some unusually slim seat design (in terms of the total width of the entire seat for a given amount of actual buttspace). In other words, I immediately wonder if Seatguru has it wrong.