Last time I went to the Grand Concourse for brunch, we didn't have a reservation. I felt like we were treated like second-class citizens for not making a reservation, so I was sure to make one this time. We arrived 10 minutes early, and the hostess told us we would be seated right on time. We were not seated until 20 minutes after our reservation time. That wouldn't have been so bad if we hadn't been told we would be seated right away. There were at least 10 other groups with reservations also waiting, so the hostess could not reasonably have thought we would be seated on time.
That aside, they have a pretty impressive spread of food. Traditional breakfast, omelet bar, donut machine, ham, salmon, a table full of candy, and dessert, and more. There is also a nice view of the river and downtown.
Still, I think it's overpriced. The brunch buffet costs $25 per person, and add another $5 for valet. For that kind of cost, the least they could do is seat you on time.