Was at the Centurion Lounge MIA this morning.
It's a gorgeous lounge with similar decor and food offerings to the other US Centurion lounges. It has a nice layout and wraparound windows with tarmac views throughout. Free 15 minute massages and manicures are available in the spa, but it opens at 9am while the lounge is open 5am-11pm.
No kosher food unfortunately.
It is located at D12 so can easily accessed from all the D gates using the Airtrain which stops at D19.