Why a spreadsheet that is completely useless and why a factorization function that cannot factorize? And, to no-ones surprise, the factorial function is not a gamma function, does only work with integers. It is like Casio tries to sell the damn thing with 'the most functions' like digital cameras with 'because of most megapixels' in. Why does things like complex math and matrices be different 'modes'? It is just silly! The display is nice, as told, but many functions feel more like gimmicks than the result of thoughtful consideration. It is also a bit sad to see that Casio has 'imported' their silly menu system from their graphic line of calculators instead of mature away from it. The aesthetics of the calculator is nice, and the build quality is okay, typical for modern Casios, but I find the symbols with 'sqrt()' and / instead of sqrt(x) and x/y, etc, to be silly and confusing. Even if the manual mentions it, I regard that as defective. The calculator is really fast, so there is no reason not to use any wheel algorithm instead of a silly table (a table likely takes up a lot more of ROM than a proper algorithm) so it not falsely report composites (1009² for instance) as primes. The calculator obviously have a table with prime factors 2.997 and tries only to divide with those values. I know exactly why and that makes it even dumber. What the hell is the meaning of this? Another really dumb thing, and this one is an death sin - the prime factorization falsely report prime when the factors are > 1000. You can't even retain a spreadsheet when exit to do another things.

I have searched the PDF manual and the web for instructions how you save a spreadsheet, only to come to the concussion that you can't. But the things the calculator are supposed to do, it doesn't do well. But it's all a sham! I did know that it was not a programmable calculator so I was prepared, even thou I don't think there are any excuses for not make a scientific calculator programmable these days.

A few months back I purchased an Casio fx-991EX, mostly because it got good marks on this forum and it had a spreadsheet - something I could see the use for in a calculator.

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