Very broad topic, your flight is presently using 772 Polaris with PremuimPlus
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Polaris seat -- best or among best in class. As a day time flight, sleep may or may not be important, but one of Polaris strengths
Service -- inconsistent --- can be good, can be not so great
Food -- below average even for TATL, although seems to be improving

Arriving EWR, with your onward BOS flight or departing on return, you will have access to the Polaris Lounge is among the best for USA airlines