It's a better kit but to get the best out of those Stepper motors you need to run them at as high a voltage as possible, 80V drivers would be best. To do this you need better drivers. The leadshine steppers are digital ones and will drive the motors much more smoothly than the analogue ones. At the end of the day it's up to you and will depend on your budget but it really doesn't do to scrimp on the electronics.

BOB's are fairly universal in that you can connect almost anyone's drivers to them as all they are doing is taking a signal from whatever program you're using to drive the machine (Mach, LinuxCNC etc...) and doing their stuff to it and passing it on the the steppers.

Hopefully someone more experienced than me will be along to explaing more fully.....