I don't know how I ever missed this benefit as a choice as a Diamond. I have an Amex plat and a wife and two kids. We're all taking a trip together in a few weeks, so I'll report back if the lounge allows for me to bring in all 3 of them as guests, or if I'm only allowed two. Even if only two, I guess it's not such a bad deal as I'll just pay the $29 fee for one more person.

I still have two unchosen benefits for 2019 and I've already qualified for Diamond for 2020. In this case, it would make sense for me to choose the guest pass benefit as part of my 2020 benefits, since I'd then be covered for the rest of 2019, correct?