Mostly I've only read good things about Sydlik and Swngle. There was a poster years ago who knew the Swingle family well and insisted they were good people who wanted a more liberal approach. Ray Franz of course famously quoted Sydlik as saying the WT needed some open the windows for fresh air and to lighten up in the 1970s. Swingle he said gave him a hug in the lift when he was being expelled.
But I do remember one thread that claimed Swingle could be racist and Sydlik could be a bully. Should be measured against all the good reports but maybe worth mentioning.
http://www.jehovahs-witness.com/topic/24043/about-dan-sydlik?page=1&size=20
Jack Barr I've never heard a bad word about ever.