Yes, I've taught with it in a multivariable calculus class. It's pretty easy to learn, and by the end of the semester the engaged students are doing amazing things. The notebooks are very useful, and will feel familiar to anyone who's used Jupyter notebooks. The language itself is what you would get if Python and all of the popular libraries were programmed by a single person with a common syntax and good documentation.

I probably wouldn't use it for "big data" analysis, but you can use it for just about anything else that is math or even slightly related to math- fluid dynamics, solving systems of equations, statistics, optimization, stock market charts, plotting values on a map, etc.

If you can get someone else to pay for it then it's absolutely worth the money- basically, if you're just a hobbyist then you probably don't need to buy it, but if you need to calculate integrals for your job then you need it.

I realize I've said mean things about Wolfram's attitude before and that his isn't actually revolutionary, but it's still a great product. Kind of like how you can't really call an iPhone X revolutionary, but it's still really good if you can pay the sticker price.