We have the deluxe Nutri-Bullet and use it just about everyday to make smoothies. As long as the lid is fastened down snugly, no problem. I cranked it up one morning with a loose lid and made a H**L of a mess because of the turbulence inside the bullet. It does ice and frozen fruit with ease. Just about every morning, I make a smoothie with cold water, psyllium fiber, protein powder and a spoonful of that potent Bragg's cider vinegar. Believe it or not, the Nutri-Bullet blends ingredients so thoroughly that I cannot detect the flavor of the vinegar! I make a lo-cal chocolate milk shake using a few ice cubes, a couple of packets of instant cocoa mix, lite vanilla yogurt and skim milk. It really turns out refreshing and cold. Well, we like our Nutri-Bullet so far and you can really hear and feel the power of that blender motor.