Very easy to use. the UX was not the best but was clearly designed with product management in mind to be very semantic.

AbleCommerce provide most of the basic functionality also it is easy to install and configure. It provides facility to purchase source code so if you have good development team it will be useful. In addition to that they used to provide updates with small fees not sure about now. It is easy to customize and provide facility to use default templates. Also if you are buying whole product you can host it on your server.

ability to customize, handles thousands of skus,