The beds are comfy (as you would expect from a top luxury hotel), the rooms are impeccably clean (as you would expect from a top luxury hotel), and the restaurant is actually good (as you would expect from a top luxury hotel).
What made the hotel outstanding was its incredible service-orientation. They paid attention to little details that I hadn't even thought to ask for. When I checked in with my family, they asked for the ages of my children. The lady at the reception said that they offered a welcome gift for children but since it included cookies (and we were checking in at 10:30 pm), she suggested that they bring it up tomorrow instead. The next day, someone shows up with cookies and pint-sized bathrobes for my children.
My younger son is still in diapers; we wrapped his soiled diapers in plastic bags and left them in the bathroom trash can. On the afternoon of our first day, we return to our room to find it clean and a diaper can (designed to contain smells, etc) in the bathroom. No other hotel has ever gone so far as to provide that kind of thoughtful service.
We ate frequently at the restaurant since kids eat for free. It's a brilliant strategy on the part of the hotel. They definitely garnered more revenue from us by offering free meals for the kids. The hosts and wait staff recognized us by the end of our week stay, and always welcomed our children with smiles and extra table activities. I highly recommend the hot chocolate from the restaurant, Yew.
I'm officially impressed by the Four Seasons and will plan to return, even if it doesn't have a frequent user program...