Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Rubber coupler poorly designed

Looks great, Heavy, powerful. I have all Kitchen aid products. They look great together.The problem is with making smoothies. Frozen fruit is apparently hard to push around. It catches on the sides and jambs the blade.The blade is spun by this small black toothed gear attached to the top of the motor. It's made of a rubberized plastic type material which is molded over a metal piece. That connection will break as experienced by other users.I'll assume that that type of mixing may have not been anticipated by the engineers. All other tyes of general blending may not tax that connection as hard as frozen fruit.Therefore if you blend frozen fruit get a different mixer.I got a Waring Pro uses the same designed coupler but is replaceable for $5.