I think the cable on that ebay posting is a clone of
http://bmtechnic.co.uk/
It's about the same price..but at least you are getting the original. you get accesss to the forums and support from the company.
makes installation of inpa, winkfp, sss one click.
If you want simple advanced error reading try PAsoft for about 30 bucks. Also lets you program basic things like running lights, alarm auto lock settings. etc.