It really depends on your priorities, and for me thats a comfortable and enjoyable flight so i always up grade, its not just the extra leg room but also
- wider seats
- priority boarding, sometimes through a separate door
-priority baggage handling on arrival at the destination
- dedicated cabin crew and a separate cabin
-priority checking in, with separate desk, which as definite bonus on the return flight
guaranteed to be next to each other (although can mean across the isle)
- extra luggage allowance of 30kg per person
- free drinks
-upgraded menu
-dedicated toilet facilities for the premium cabin
- larger tv with individual programms so you dont have to watch the same as everyone else
Who would want to spend 10hrs in cattle class!!, if you can afford it then upgrade in my opinion