Is it a 757-200 or 300? Is is a newer one with IFE, or an older one with none.
Is it a 767-300 or 300ER? HUGE difference. Likely not ER. If it's a regular 767-300, the F seating is very cramped feeling. If it's an ER, or 76W, GRAB IT!
I'm sure others will ha e more to add. . . . .