Umbraco has consistently proven itself to be one of the best CMS options due to its unlimited functionality and customizability. Though packed with a gazillion of enterprise level features - the platform has a clean and intuitive interface that makes it extremely easy and simple to manage and to create new content.
Not to mention about the drawbacks of the software. Umbraco does have some significant weaknesses, the implementation of which would made the platform much more universal. Specifically, they are: developer-oriented, steep learning curve, expensive, etc.
CMS2CMS automated migration service has been specifically developed to ease the conversion process from Wix to a few easy-to-follow steps. No special skills or programming experience are expected to operate the tool properly.