I am writing from Cairo airport we are sitting in the buisiness lounge for the first time
Business class:
1) You are a priorty (plus) 2) Your luggage comes out first (because it is a priorty) (plus) 3) The seats are bigger (a big plus) 4) The seats are more comfortable (another big plus) 5) You have an extra blank seat between you and the stranger ( another big plus) 6) You have a private lounge that serves free food, drink and internet (neutral) 7) Everyone is nicer (doesn't matter) 8) There is a red rug under your foot while you are checking in (not necessary)
Soooo the extra money you give is worth to try once but it isn'tr big deal for me