I made the leap and purchased my Vitamix about a month ago, after having owned another smaller single serve type blender.  I have used it mostly for shakes and making nut milks so far, and absolutely love it.  The Vitamix 7500 blends everything smoothly, evenly and quickly, and is relatively quiet, given its power and size.  Even with blending smaller portions, I have not experienced any issues like some others have mentioned.  I am absolutely in love!