Originally Posted by
Gindernation
The main reason GM is important is for domestic SDC and lounge access on our international trips. Is the latter even worth it if I will be upgrading to SC guest access (AMEX reserve + choice benefit) along with existing Priority Pass?
You don't even need to do that. As a Sky Team Elite Plus (which all GM's and higher are) you get lounge access for you +1 guest on all international travel at all Sky Team lounges while traveling on any sky team airline (excluding third party lounges and does not apply to a few international destinations such as the Caribbean).
Domestic SDC is good point, I forgot about that. This cannot be extended to her from you DM status. That being said, paying for SDC is $75, so think about how often you will likely need to pay that as another determining factor.