I do! I made my ADRs over the phone on May 25, and I have changed almost every one of them since then! Either I got better times, or entirely changed my mind about the restaurants. Out of 8 ADRs, I changed 6-several times! The two that I haven't changed (CM and 1900PF) I try to get a better time, but nothing is available. And my times aren't bad, they could be slightly better.
I does feel good to finally get something you have been looking for a long time! I compare it to fishing!