It does however work with blazt, ecutalk, conzult, etc.
Even if you don't have Nistune I strongly recommend getting the blazt cable for two reasons. 1. It is a pain to drive with the big connector down near the clutch (easy to disconnect). 2. USB is nice. Not many laptops come with rs232 anymore.
If you do want to go with the ebay one..I'd sell you mine if interested.