Yay!!! We were able to make all of our Sept. reservations too, with the restaurants that we wanted. I've heard some people say they had difficulties, so I feel very lucky.
I've done mine for Aug/Sept too. I didn't have any probs either. Thought it best to pre-book them all as on DDP which they're now offering free whilst we're there-expect restaurants will be busy!
Just done mine for our October trip. Had to change the time on Chef Mickey's (only by 10 minutes) but it is for 180 + 10 days and its the 10th day of our trip.