I recently visited the Newark President's club in terminal C for the first time in a while. Here are some pictures and notes on the lounge:
Very large and well staffed
Staff were courteous and friendly
Nothing was brand new but everything was nice and well maintained. Everything was the same as it was four years ago.
Very nice ambience and atmosphere compared to other lounges
Great view of the Tarmac
Free snacks, drinks, and newspapers are always a nice perk