Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

This calculator is terrible. I've been a HP man for a long time and now that I'm doing my Ph.D EE I thought I'd upgrade from my beloved 48GX. Was that a mistake. The keyboard is worse than you could imagine !! Was any testing done at all ?!? Miskeys all the time, it's loud and uncomfortable. My Sd card didn't work and the screen flickers, I have a patch for that, when I get the time I'd FIX my calculator. The poor quality of this machine, hardware and software is inexcusable particularly for the price. Do not buy this calculator !!!