I purchased the Ascent 2500 to primarily blend smoothies over the Blendtec or other brands due to the many rave reviews regarding, not only the brand, but the specific model. I purchased it new from BestBuy, in black, and took it home. When I was using it, it sounded pretty loud, which I expected, it being a 2.2hp motor. However, over the course of a 3-5 days (using it everyday) a slight grinding (?) noise started to come from the machine. Then on the last day I used it, before exchanging it, to make a smoothie with the preset, the motor shut off for maybe a quarter second then turn back on at the previous speed. After consuming the smoothie and attempting to wash the container with water filled halfway and a little dish soap, the same thing occurred. I called Vitamix and the rep explained that should not happen. That very day I went back to BestBuy and exchanged it for the Pro 750 which, while loud, has a smoother sound to the motor and no faults almost a week later. I am also a bigger fan of the more sturdy build (less plastic).