The best Casio keys in my opinion were the hard plastic ones of the 80s. The newer models always seem to have a couple of design flaws that affect usability.
I have a few late 1970s and early 1980s Casios with the same buttons and their resistive membrane becomes very brittle and breaks, turning the calculator into a brick. I personally don't see many being sold in the used market anymore when compared to TIs and HPs, perhaps suggesting these models didn't age well.
TI-85 eats Casio toys for lunch ![Cool 8)](https://www.eevblog.com/forum/Smileys/default/xcool.gif.pagespeed.ic.cOxV6sPNRd.png)
Horrid screen. Fixed in TI-86 ![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
Cough, Ti-89/92, cough.
Casio FX-991EX ClassWiz is a Scientific Calculator not a graphing calculator.
Like multimeters and oscilloscopes, both measure voltage, but you wouldn't mixed em up, right? ![Roll Eyes ::)](https://www.eevblog.com/forum/Smileys/default/rolleyes.gif.pagespeed.ce.XcUK202Yqt.gif)
And also Casio is 20 USD. Best price performance there is.
You bet your ass Porsche is nicer than Clio Sport. But in reality they are equally fast point A to point B. Road conditions, traffic and average persons driving skills will take care of that.
At this level of scientific calculator, I find them all pretty much the same, both in display and in tactile fell - the HP35S, which I find well above average in terms of keypress feel and quality, is my daily driver. However I don't use it for scientific but base conversion instead
I disliked the low contrast display of my former TI89 Platinum, even when compared to the graphical HP48SX/GX. The Casios and HPs are much better.