I'll transit JFK in two weeks and I think I'll try to visit all 3 lounges. From what I am reading about the Chelsea, however, I think I'll stop there for more than just a tour only if I want dinner.
Honestly I was happy with the "old" AA Flagship lounge, I would be sorry if in the end the Chelsea and Soho lounge were not even at the same level... and the ex-flagship ended up worse than before.

For full disclosure I'm not really interested in champagnes and I don't drink spirits