I'm back from my week-end at the Sanderson where I used my Morgans Hotel Group Global Card for the first time. I, unfortunately, felt like the staff couldn't care less that I was a global card holder.
No upgrade at checkin although they still had available suites on their website.
We were denied a 3:30pm late checkout (they offered 2pm after a lot of talk...). Once again, I checked on their website and our room category was still available for the same night so it's not like they couldn't offer it because it was already booked (which is what we were told...).

The only perk we received was complimentary internet access but said internet was very slow and non working at times.

I thought that holding a global card could make me switch some of my travels to non-Amex-FHR Morgans Hotel group properties but it definitely won't.