The thing with drivers is that if they work, you are none the wiser. At the £13 price, who can argue, it is disposable. Humble pie will be light on the stomach.
I cannot see the ebay one being any different from the ones the cnc4you sells TBH, and I have bought them and been happy. That was for learning though.

On my working machine I went for the best I could afford. Lost steps are not something you want to have to deal with ever.