I have noticed no flaws in my model, the computer is well made and the buttons are evenly (which should, according to other reviews probably not always be the case with me but everything top).
Unfortunately, I also have to say that I find it a pity that the conversion options binary, hexadecimal, octal, although work wonderfully with integers, but unfortunately on strike at point numbers, but that is noisy colleagues well with other competitors (Sharp, Texas) to be the case (eg the Windows calculator, this is also only integers).
For me, the computer fully served its purpose.
Greetings, Forseti