I flew TAP out of JFK about 3 weeks ago. As the flight leaves very late, I ended up getting to JFK rather too early. However there was no problem getting into the lounge, which is run by Jet Blue (or more likely for Jet Blue). The lounge is rather small and pokey and I can imagine it's quickly full. It's windowless and mildly claustrophobic. Despite being small it's on two levels with stairs and the disabled lift taking up a lot of space.
You get a 15 dollar card on entry, but the guys at the bar never asked me for it. My plan was to eat in the lounge and then sleep on the flight (in view of the late departure time). There are minimal eats on display, but you can order off a menu and I ended up with an acceptable cold platter of cheeses and cold cuts.
I ended up spending a good hour more than I would have wanted in there.