Stepper controller to manually input a specific degree

[Jonathan]

Convenience. With a standalone controller, you just need to plug it in and go, with none of the faff involved with setting up a computer. Then when you're finished, you can unplug it, put it back on the shelf/in the drawer and forget about it.

Yeah obviously it's more convenient, and if it's cheap then fair enough... but spending upwards of £192 on the DivisionMaster for convenience is the wrong priority in my opinion.