It's all fun and games until you have a big mess to clean up after enjoying your delicious coffee creation. There has been a ton of feedback about splatters all around the kitchen or work area from all of the mixing. To avoid this, make sure you are using a large enough mixing bowl to avoid over-spray but small enough to contain all of the ingredients for your whipped coffee actually get whipped together. It has been concluded by others that a whisk or hand mixer creates much less of a mess than a milk frother so consider one of those mixing methods.