My mom just bought me a Vitamix Professional 500 Blender from Williams-Sonoma for Christmas (yay). But lately I've been thinking i got a defective unit. Theres a 90 day return policy so I have until March to think about it. I was just blending a smoothie and there was an odor, almost a burning smell. I would stop blending when I smelled this. Im sort of scared it will blow up on me and the blades will fly into me(sorry...I just watched Final Destination lol and it sounds like a jet engine). Plus it seems to have trouble blending. A vortex would form but then the vortex would stop. The blender would remain on but it doesn't seem to be blending any further. I would call Vitamix but their offices aren't open right now.