The large blender works for me but the individually blender and blade have been difficult. I had to buy a new blade because the first one sprayed out something black into my smoothie. The second one I got has to be twisted on so tight for the blender to work that I can barely get it off. Sometimes I can't get it tight enough to make it turn on. I have had other Nutribullet products and typically love them. This one was not a good product for me.