The first time, and it must be my fault (?) I was perhaps badly screwed blades, by unlocking the glass bowl, the base is unscrewed and all content has rependu on the work plan . Moreover, mixing a little longer, less than 30 seconds, however, there is a burning smell which makes me fear that the engine grid, as my old blender. So I make several mixes of 10-20 seconds to avoid burn out the motor. I am afraid to use too much or the pulse speed 2. The glass bowl is heavy and solid. This mixer supports the ice but I stay booked on longevity.