The most important features are:- Easy to set up for new users, even without knowledge of php or magento (or if you work in another CMS). - It's easy to customize your catalogue.- Price rules, notifications by email when products change price etc., make it easier than Magentos builtin modules manage our catalogues, no matter how big they grow! Nothing as such but we had problems because some customisation was not compatible between versions which makes upgrades difficult sometimes. For onlineβ¦