As a tall flyer, aisle width made a difference to me on this plane. I think of it more as the real estate associated with the seat. In the sCO seat, the furniture is big and bulky, which puts a little more space between you and the aisle, and you and your neighbor. With the narrow sUA 763 seat, I run out of seat real estate, and my knees are in the aisle, having to lay on my side for sleep. With part of my body in the narrow aisle you get bumped a lot. If you're not tall, you probably don't have as big of an issue with this seat.