8 stays and 0/8 suite upgrade for me as SPG PLT
Although I have to say I receive upgrade on all the stays
The best upgrade I got is at The Athenee Bangkok. from cheapest to royal club room (just below suite)
Still have 6-7 more stays this year. hope the suite upgrade rate is improving
I believe the upgrade benefit is really based on alot of things.
Management policy, hotel occupancy (it seems like St Regis Singapore is always have some sort of event going on hence only 1 or even none upgrades available for SPG PLT.) and also FD staff
Some FD staff readily upgrade members, and some just assign whatever the room assigned to the members at check in.