Thanks both. That's very interesting about the headrests/height of the seat - it does look like the slimline seats have less height on them? And I certainly want to be able to rest my head on something. Not keen on a neck rolling back! Especially for 3 hours without 'free' champagne so numb the pain!
Do the normal recaro seats in non exit row have less space on the A321 neo than 'normal' - which I find pretty tight anyway at 6'4" unless i'm in row 1...