Sharp EL531WBBK (Black) Scientific Calculator Review

I have this calculator for about 1 year and the paint of the digits have completely faded away.
Often when I push a button, the calculator does not respond.
When you push a calculation button twice, for example +, or first push - and then +, the calculator gives an error, while other calculators would take the last entered calculation button.
When you would like to see a subtotal, for example 3+5+8+ other calculators would calculate at every entry of the +. This calculator doesn't, so you have to enter = first and then do the rest of the calculation.

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