I upgraded my site to the Premium E-commerce and that was the biggest mistake... Their mobile sites do not have e-commerce option and they have been saying that they are working on adding it for 2 years now. Really, 2 years for something that hundreds of customers are asking about??? Their main excuse is that HTML5 sites display on mobile Devices so try that. Well, after spending days on re-building the look of my website in HTML5, my cart and store look completely messed up (if they display at all) on all mobile devices. On the rest of the browsers, my site loads so extremely slow that I am actually not willing to send any customers there.
I am a Graphic Designer and I have a good concept of images, file size, etc but every time I try to explain the issues to them they are rude and completely unhelpful, the make it sound like it's my fault and their responses take days, if they even respond to your issue. They almost seem like the don't even know what they are talking about and not even reading the issue you have in detail.
Their templates are beautiful, no arguing that but unless you want a personal website, do not use them for anything else. If you want to have a business (e-commerce) web sites stay away from Wix by all means. They are just setting up your web store for failure.
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