I am a Diamond and I get one after each stay. Every time I had an issue and I addressed it via the email response, the GM of the property in question contacted me within 48 hours. As a result, on each subsequent stay, I end up getting a room upgrade and extra little touches in the room - my favorite beer on ice, or an extra bottle of water, etc. I have been a Diamond for 3 years now, and I have used the complaint recourse only 4 times.