Due to the ongoing promotion of a free night certificate for every four stays, I have found myself staying at Hilton properties more regularly than usually.
Hilton has had the Nor1 upgrade options for cash already for few years. These Nor1 upgrades are space available and confirmed at the time of checking in. Now, they are also promoting points based and guaranteed upgrades at the time of reservation, and when you are accessing your reservation online.
I now have five examples when it comes to these space available and guaranteed upgrades using points, and what I have actually received at hotels without applying them at all based on my Hilton HHonors Diamond status.