Instruct: Classify Amazon reviews into positive or negative sentiment
Query: do not buy it!

i'm electrical PHD student. i bought this calculator becuase i need a powerful one for the test(normally i use MATLAB on my computer to do the calculation). my boyfrid recommended me TI89 before i bought this one. But i went for this anyway because i like HP brand. i made a really bad decision. now the calculator is dead after setting in my drawer for a few month unused. the HP support told me that they can replace the product for $126 plus tax and shipping.