It's an awesome tool! Very powerful, especially in lower classes. I make sure I actually know how to do something by hand ( as it is presented to me in my math book ) before I use it.

I actually started in beginning algebra with it, and purposefully didn't learn any of the functions that worked with X until late intermediate algebra / college algebra ( Though I ended up missing the last 5 weeks of my intermediate algebra class due to some really scary health issues, so it was a lifesaver )