As others have noted the processing time is fast (so is the TI, but this displays things like graphs much faster)Some disadvantages include:(-

I prefer Casio natural textbook display as I can easily replicate any equation in textbooks and save them for later

Plus CE had a much prettier display, however the monochrome display of the Casio was much easier to read

This allows me to review any blank or empty-minded areas and anyone who wants this Calculator I most certainly recommend it if you prefer a natural display over TI"s Linear display

The natural display really works well, better than any other calculator, and it graphs at lightening speed and finds roots etc effortlessly

The only small disadvantage is that connecting it to the internet isn't as easy as with TIs, and there appear to be fewer programmes available for the Casio

But if you go on to study circuits and upper level engineering topics, then this Casio 9860gii sits in a sort of "nowhere-land" -- It isn't as powerful or usable as you'd like, but also not as simple or cheap as some of Casio's great scientific calculators.