Yes, it is expensive. Not just 750, you also have to pay another 750 for deployment license per production environment. And it is 1200 if your devs are working on more than one project.

That said, I'd argue it is still worth it, assuming you can afford it. It will save you tons of developer time down the road. Their documentation is top notch too.

For example, it has graphs built in! I have never seen any grid library do that.

Again, not affiliated with them in any shape or form, just a happy customer (trying to get a discount from them though, ha!)