Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not practical at all!!!

Very poor design and extremely frail. Doesn't do well with any nuts bigger than an almond, and even for smaller ones it was quite challenging. The whole truth about this "made out of heavy duty cast aluminum" tool is that it is indeed heavy, and it cracked wide open (in the two metal halves kept together by a tiny screw), as I tried to use it on a California nut. Try to buy something else.