One of the reasons I purchased this module, aside from its strong feature-set, is the exceptional customer-service reputation this vendor has. I had some initial problems with installation, and modzzz responded and helped me to correct the problem within a few hours. He is also very good about updating his products to new versions of Dolphin. The sub-categories feature of the mod is a very nice touch! I own several of his products, and I am planning on buying more!