I have installed on two websites. Both work exactly as advertised. Your Joomla "look & feel" is preserved when you install JCart, and you treat it like any other Joomla component. I didn't need to learn anything new. The JCart component is a bridge to a full installation of OpenCart, with all the extensions they have now available to you. Want price variants for an apparel store? Its in there with an OpenCart exension. This cart gives you the best of both Joomla's and OpenCart's vibrant open source communities and great support, too. Three thumbs up.