Thanks for the input.
I am staying 6 (award) nights in end of June. I assume that is peak season for them... but has anyone stayed in June and can advise if it is indeed very packed/busy or not so much. I want to gauge my chances of getting upgraded. Also, any experience of getting upgraded if you sign up for Ambassador status at check-in. I am Plat Amb, but would not mind paying that $200 to get my gf signed up to get an upgrade!