I received this unit as a replacement for a ProLine immersion blender that was still under warranty when it failed. The ProLine version had speed settings on the unit so the speed could be increased slowly as needed, especially when using the whisk attachment. This unit "says" there is a variable speed controller but it really doesn't - the speed is high and the whisk makes a big mess spewing liquid contents all around. I love my KitchenAid small appliances, just not this one.