Swiss meringue buttercream is a delicate frosting that can be challenging to make. It requires a double boiler and a candy thermometer, and it can be difficult to achieve the right consistency. Additionally, SMBC can be sensitive to heat and humidity, so it can be difficult to work with in warm weather. However, the rewards of making Swiss meringue buttercream are worth it. It is a light, airy, and flavorful frosting that is perfect for piping and decorating cakes.