Please can someone in nutshell explain what are the prime benefits of being an Ambassador? I've read some of the stuff on the website re late check-out, guaranteed room upgrade etc etc but is there anything else?

Another question is related to my Spire (Diamond) status and Ambassador. I need 13 more nights by December 31st to re qualify for Diamond for 2023 which is going to be challenging. But I have just been offered the 40k points swap to get Ambassador - so my key question is whether Ambassador is effectively a "higher" tier level than Diamond? In other words, if I do the 40k points swap am I effectively renewing my Diamond status too and I retain all those benefits + also get some more with Ambassador status?