I would love the job but would never be in a position to go for it. I read an article by one of their Twotter skippers which said in Antarctica it was all single pilot, but they always had "somebody" flying with them to keep them company - a scientist or technician volunteer from Halley.
One of the SFIs at CAE with plenty of Twotter time said he went for the job a few years back - too much multi-crew time is a bit of a disadvantage apparently.
All second hand but hope it helps.