I wanted a blender that would be the last one I would ever have. I knew I wanted a stainless steel container and a powerful motor. The Kitchen Aid (MODEL KSB55SS0B3) had all this. It worked perfectly, until the rubber COUPLER that was mentioned earlier got worn out. Now I find that Kitchen Aid has no replacement. It took two years to happen but eventually it has to happen. Bummer the stainless steel container, the blade and the motor have a long life expectancy, but can't get a replacement part to make it work! If I was Kitchen Aid, and I knew about this flaw I would not continue to sell this to unknowing consumers. I saw a vita mix at a local home show the other day. It is guaranteed for 7 years and the coupler is not made of rubber.It is a very sturdy metal coupler. What does that tell you? I will get a vita mix!