I've been using it for more than 6 months. On the plus side, it was easy to install, has good battery life, button press and response times are decent, and it sits comfortably at an angle. The ability to start the calculator from the device is also positive. My biggest complaint is that when using it in Excel (which I mostly do), it's awkward to enter a negative number: either you have to press the minus sign on a laptop or the backspace key on a wireless keyboard before typing the minus sign on the keyboard. Also, the tab key should be in the top corner. Still better than using the top row buttons and still worth the money.
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