First off don't think that I did not like Tusker House. I greatly enjoyed the food and the opportunity to meet and greet the characters and get a really nice family photo as part of our experience.
Now with that being said I will tell you that I had a 10:30 ADR on 9/5/08. We did get there a bit later than I would have liked but we were there by about 10:15-20. We ended up waiting to be called until about 10:50. That's right, we had a good 20 minute wait after our scheduled ADR for our table. Once we got in we met one character right after another. My wife and I had to take turns getting food as our 2 year old daughter was too tired to get breakfast.
Now by 11:15 the Breakfast to lunch switch over was already being started. and by 11:30 there was no breakfast foods available. It was all lunch at that point and I don't know what Disney's policy is for breakfast/lunch buffet's but our waitress said we could stay as long as we wanted and would not charge us for the lunch buffet, which I didn't even think about as being more money for the lunch buffet.
Unfortunately during this whole mess my wife wanted to get a pastry that she saw earlier, but by the time she went back to get it, it was no longer available. Thankfully the waitress was so kind that she actually went to the bakery next door and found what my wife was looking for.
So long story short, if you would like to keep the 10:30 ADR, please arrive EXTRA early say maybe 10 AM. Please remember that an ADR is not a true reservation for that exact time, but that you can arrive early and that will give you a sort of priority seating ahead of those that arrive after you.
On the other hand if you want to try your luck and keep the 10:30 and have both breakfast and lunch this may be a good time for you. Just keep in mind that they may try to get you to pay for the lunch buffet as well. Again I don't know their policy on this situation, just wanted to mention it.
Again I love the new Tusker House and next year I hope that I can get an earlier ADR, but remember that is my personal opinion, for what it's worth.
Hope you enjoy your time and experiences as well if not better than ours.
Jason