Flew EC again yesterday on a 767-300ER (G) in seat 17B. Worth every penny of the extra money once again, didn't sleep on an overnight flight but it was certainly made much more comfortable and the extra recline was noticeable and appreciated!
When added to the extra comfort experienced on the outbound flight, I would certainly recommend paying the extra fee (unless you're an elite and able to get it for free, alright for some
)