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In my opinion, this is the best graphing calculator out there. It is extremely fun to play around with, use for math, graphing and even writing programs. It is a bit hard to use, with so many buttons, but I got used to it. The price that I bought it for, brand new, was €120, and that is quite much. But I think it was well worth it. I use it every day at my math lectures and to solve problems. You can install custom programs, like simple games and tools to use on the calculator. Typing programs on it is quite hard, so I suggest doing it from a computer and then uploading them using the provided link cable.