I have had brunch t this location twice. I recommend reading the body of each review before making a judgment on this location. Brunch is vastly different than a private event I would think.
I have visited at the end of January both times. Bring your sunglasses if you sit close to the windows near noon. It gets pretty bright inside. Of course you don't have to sit there either...
The brunch is vast. I highly recommend making a plan BEFORE you pick up a plate and dive in. I didn't the first time and I regret it. This second time I was prepared. Think of invading a country and you will understand the magnitude of the choices you will be faced with. Will you be making an air, sea, or land attack? Are you going to bomb first or just send in the ground troops?
When I'm at brunch, I'm making decisions about my level of hunger, if I'm in the mood for breakfast foods, and how many flavors I want to indulge in. This time I wanted to take advantage of the breakfast options that I didn't get a chance to last time. They have a pancake and omelet station that are both really interesting. I chose pancakes.
Warning: the pancakes are TINY. These aren't Denny's sized ones. They are about the size of the palm of your hand. You get to choose the additions, but get ready to come back for more as one wasn't enough for me.
Their fresh fruit was amazing.
The dessert plates are astounding. There is an entire table dedicated to ONLY sweets.
I can't speak for the meat and pasta offerings as I don't like to mingle breakfast/sweets with dinner fare. It all certainly looked good.
When you're finished, you can wander the mansion and see how the other half lived. It's a great thing to do while in Phoenix.