I don't know how to answer this?? Is it worth the money? hmmm. Usually, someone asks that when they're going to spend a bit more on something to get more.
But those are the cheapest kits you can buy. You can read many posts here about all the problems people have with them.
I've never used them, but I certainly can't recommend them. Also realize that you're paying $100 for shipping. That doesn't make sense to me if money is really tight.
If you don't mind soldering, the HobbyCNC should give you much better performance, for a bit more money. You can save some money by just buying the drive from them and shopping around fr the motors and power supply, but It'll probably still cost around $350, or $100 more.