What does Wix do well? Wix is really easy to use and you can create websites very fast and easily. There are a variety of templates for lots of topics. You select a template and easily modify it and your website is ready no matter of time. The websites created with Wix also look professional.
What does Wix not do well? You can create basic websites very easy but if you need professional functions, sometimes Wix could not fulfill your needs. Mobile layouts have limited options to edit. I generally need more than the mobile layout functions served. When it comes to support it is better to find a solution yourself. I can understand they have an incredible amount of customers and support requests but the support staff needs to be more trained.
What do you wish you had known about Wix before using? There is no trial period to evaluate the functions. Prices are not very expensive but it would be better to try the functions first.