I'm a Delta Platinum, Hilton Diamond, Marriott Platinum, and Avis Preferred Select. My experiences in a little over a year-and-a-half of FF is that Delta lives up to there end of the bargain. I've had no nmajor complaints with getting the stated benefits from Delta. I've earned my Hilton status at one Hilton Garden Inn and have not experienced other Hilton properties yet. The one Garden Inn (Albany NY) has been super in responding to needs and the program guarantees. Avis has been great about providing me with upgrades, sometimes two or three levels above my reserved level. Marriott on the other hand doesn't seem to push their program benefits to their properties. I would say that 60% of the time I have been told that the particular Courtyard or Marriott property I am at doesn't participate in that benefit (upgrades, platinum gift, discount at the gift shop, etc.) And, the way I read their program rules, it looks to me like each property is pretty much free to adhere as they see fit.