Can't ever go wrong with a TI-Nspire. I've used the normal TI-Nspire CX at school during all my 4 years in high school, so I've become fairly comfortable with operating it. But, I felt it was time for an upgrade, so I chose this, and I've got to say, best investment ever. As an engineering college student, this calculator really helps save time. With its CAS, solving integrals and taking complicated derivatives couldn't have been any easier. The buttons (arguably), in my opinion, feel very nice to click and make a satisfying "clicking" sound, which I like (compared to the normal CX). It has functions from solving systems, to analyzing statistical data, and you can even program your own functions using TI-Basic. All in all, this is definitely a must-buy for any college student taking high level engineering classes. One thing to note is that this (and many other CAS calculators), are not allowed on AP math exams. Also, as I'm sure you've heard. graphing calculators are not allowed in lower college math classes either (ex: Cal 1, Cal 2, or even Cal 3). It is, however, allowed on the SAT and upper-level engineering/science courses in college, at least in my experience.