I love it. It's fast, smart, and it comes with a cord to sync it to your computer. You can transfer documents onto and from the calculator. I put formulas, graphs, tables, and tons of other stuff. When I first got it, I thought, this is a huge calculator (which is true). It took me about a couple hours to learn how to calculate 2+2=4, and it took me about a day to graph. But now it does things I didn't even though a calculator could do! Even two weeks later, I'm still figuring out things it's capable of. You can save notes, graphs, and formulas. It even has a way to connect to a network (although I don't have that figured out). If you go online to [...] you can order a interchangable keypad for free. The website has guidebooks, tutorials, and if you get the calculator you can download software and the new O.S. for free.
I could ramble on and on about it (which I have done)so I'll stop here. But I highly recommend it to anyone looking for an advanced graphing calculator.
One last thing.I got the normal TI-nSpire, not the CAS one. I don't know a lot about the CAS but I do know that you cannot get the free keypad online.