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From what I have read, it is worth it and way better than any of the other US airlines.
Can read a full review below.
https://onemileatatime.com/reviews/jetblue-mint-suite-a321lr/
onemileatatime.com
Review: JetBlue Mint Suite A321LR New York To London
A detailed review of JetBlue's incredible Mint Suite between New York and London. Here's everything you need to know about the experience.