Summary: Bought this because of claims it had large buttons for the visually challenged users. It does. It's awesome. I was worried that I was going to have problems because I was moving from an accounting calculator (where you hit the math function button AFTER a number) to a normal one, and it was a similarly large layout. But nope, I'm good. Being solar, I did notice that it was a little slower to respond on mornings when I was working before the sun came up.