Upgrade request was denied while hotel still has suites available for booking. Customer service rep suggested that I should have booked my rooms early, which I did, and retry upgrade request in case someone cancels - though no idea how to find out if a cancellation has taken place. I have had virtually no luck using the upgrades this year with 4 set to expire. Will never choose this option again. In fact, will look into other programs beyond Marriott.
Lifetime Status: Lifetime Gold
Hotel: Courtyard San Diego Downtown
Location: San Diego, CA, USA