I purchased this waring blender after doing an extensive search for the perfect smoothie making machine. This one has won out. I make 48oz smoothies with about a 12ozs of liquid, protein powder and the rest is frozen fruit. (all of this put in at once but in that order) I run it on low for 30secs and then high for 60-90secs...comes out smooth every time. The only issue I've run into is my fruit freezing into a solid block before i switch into high. I just knock'em loose and blend on!