I have yet to be upgraded....do the hotel staff upgrade automatically and just not tell me or do they usually say anything. I tend to stay at lower end (FI and SH) so I am not sure if there is a difference in rooms at most places
Depends. Normally you can ask and see if there is room for an upgrade. In my experience it is hit and miss, given the small number of suites available, which are excluded in the terms and conditions, but often possible.