The frosting for this cake is amazing. It is glorious to pipe. If, however, you intend to frost the entire cake- top, sides etc, I recommend serving it room temperature. It firms up in the fridge and will not stick to the cake as well. I love it both ways. When I pipe, as you see in the photos, I personally like to chill it. The embellishments will also hold their shape beautifully if left at room temperature, though. You could always chill it and then pull it out 1 hour before serving for the best of both worlds.