I've tried a bunch of graphing calculators, but this Texas Instruments TI-Nspire CX II CAS is my new favorite. The color screen makes graphs pop in a way you just don't get on black and white displays. I especially loved how it handled 3D plots - they were crisp and easy to navigate.
One minor critique though, the button placement took me a few days to get used to compared to my old calculator. Once I was familiar with it though, it was smooth sailing. Overall, this is a solid step up from other graphing calculators I've used.
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