Summary: The Casio FX-CP400 is wonderful. It is a huge upgrade of the Casio Classpad 330 Plus. Looking at the two calculator models together is like looking at 1950s black and white TV next to HDTV. This calculator is a bargain!
Summary: I previously owned a Casio FX-9750G PLUS and in the course of my classes ran into math problems that the old calculator could no longer do, and decided it was time to finally upgrade as I knew I would eventually do. I debated between this and the TI CX CAS handheld and decided for the few additional dollars this was the better choice for me as I had already had good luck with Casio and trusted their products. As far as calculators go, I love it.
Summary: This is a CAS-class calculator (think N-Spire or HP-Prime). It is not as fast as the HP, and has fewer features; however, the user interface and huge screen make it a real pleasure to use. Casio has really spent a great deal of time thinking about and refining the user interface of this machine so that it is far less difficult to preform simple to truly complex calculations.
Summary: First, TI calculators are ubiquitous; they are more expensive than casio fx9860gii but less powerful. Casio can write calculus equation while ti can just do calculus inside the graph. Second, casio has better design. This calculator really looks better than whatever ti83 or 84. Also, this calculator displays pretty well. The true natural display. (Even if ti84plus silver edition has natural display, but it's not exactly the same as textbook.
Summary: I am an electrical engineering student who has been using the classpad 330 for years. I tried just about every advanced calculator out there and the classpad 330 was the best. Now the classpad 400 has everything that was great about the 330 and made it better. The screen is bigger than the 330 and just gorgeous to look at. The black finish on it looks like carbon fiber and makes it look even better.
Summary: I bought this calculator when I was finishing highschool with college in mind. despite not being allowed to use my calculator for many of my courses I have still had the opportunity to test out several interesting features. My major requires I take 3 courses of calculus (differential, integral and vectorial), one of algebra, one of statistics and a couple of econometrics.