The only problem I had was that I couldn't "step" points, that is have them expire X time period after purchase that earned the points. It was expire all points or none for the version that supports Joomla 1.5.x
After contacting the developer he refunded my purchase but then contacted me to let me know he had found a way it could be done. Within a few hours he had a new version that did just what I wanted to do. Great support, great product, it is so easy to use you will not regret the purchase.