I use the standard Vitamix almost daily. I wanted this smaller version for single serving smoothies of my green drinks. The concept is great but the first time I used it, I hadn't tightened it enough and it leaked. The next time, after blending, it was so tight that I had to go to a neighbor to help me unscrew it. The outer overhanging cup makes it difficult to get a good grip on the container to unscrew the blades. I don't use it as much as I had hoped because of this awkward combination. I love Vitamix products as a rule, this one is disappointing.