While it is fair to say that probably has some supporters to win over, Swansea now appear to be on the right track under the former Barnsley boss.
After just three points came from his opening seven league matches, 15 points have been collected over the same amount of fixtures that have since followed.
Although they suffered back-to-back home defeats to Leicester City and Watford, the Swans bounced back with a 1-0 success at Blackburn Rovers last time out.
The clean sheet was as important as the result on some level as it represented just the third Championship shutout under Duff, and the Welsh side have now recorded 10 points from their last four away fixtures.
At home, it has been more of a mixed bag, yet Swansea have only failed to score on familiar territory on just one occasion this season, that being versus Watford last time out.
From Sunderland’s perspective, it has been all or nothing for much of the season, with just one draw coming in their opening 14 fixtures.
A recent three-game losing streak has piled the pressure on a period of six defeats in 13 games not what the Black Cats hierarchy would have expected after reaching the playoffs in 2022-23.