The tool isn't sold out? I heard that xtreme conversion is excellent (and does almost the same thing) for a much better price. $177
As an affiliate, I don't think you can put a price tage on being able to track conversions down to the keyword level. This is priceless. But, for the most part you can do it for free yourself with several of the affiliate networks. Most all of them have a sub-id function. It just takes more time to input and then track yourself. Still, it is worth it. Most affiliates advertising on adwords will know that a certain adgroup or campaign is profitable, but they do not realize that maybe only 10 of the 100 keywords are actually making them that profit.