Passed through JFK T8 (in J, Greenwich Lounge) a couple of weeks ago. Basically the same as when it was the old AA Flagship Lounge, no real complaints, and definitely an upgrade from Lufthansa's J lounge. Had a nice shower, although it was a bit confusing how to book it and they don't make shower availability obvious. (ask at the front desk)

The former AA Flagship Dining section was a bit 'hidden' and much quieter than the rest of the lounge. I'd recommend going there if you want to avoid crowds.