Just had 5 years of nights with a 3rd pair of eyes behind, young and old, and its definitely the way to operate when the fan is flinging, or you're losing the fatigue-fight. Having said that, those who disagree have probably never had the opportunity to work with a maestro of the panel whose tech knowledge of the aircraft always puts your own to shame.
As for JW411, couldn't agree more. Coventry has produced some of the youngest mature masters of their art you will ever meet, and I've flown with many of them in their subsequent careers. Forget all the psychometric babbledegook; if a guy has Atlantique or Atlantic in his CV, you should hire him.......simple as that. He has probably already been to corners of the professional aviating envelope his interviewers have only ever read about.
I've no side to this, just speak as I find!