There were about 100 seats (maybe a bit more) and the seating is assigned. You are taken to your table by a CM when you check in. I will tell you that we never once felt cramped, crowded or any of those things. There was a PhotoPass photographer on hand as well.
The desserts...lots! From cheesecake to cupcakes. My son (he's 18) loved the mango shooters. Chocolate covered strawberries (they were huge!), brownies, mousse, you name it, I think they had it. As well a variety of drinks such as coffee, tea, juice, etc.
We were able to watch the Main Street Electrical Parade from our seats and had a clear view of Wishes as well. Was one of the best $$ I spent at WDW in my book. We did this our last evening of our trip. I can't wait to do it again and am personally making this a must do for any future trips. I highly recommend it.
And, it was fun to get ushered out the "back way" behind Main Street afterwards to avoid the massive crowd on Main Street.
Here are a couple of pictures I found: