I have an active site for a long time and finally after so much time i moved from the old blog to the new blog. i must say its not the first time i tried, then went back to the old blog.
due to some changes in the datatbase area i decided to make the leap and here are a few missing parts in the wix system:
when creating a repeater you cant pool from the data so many things like: author name, author icon and the rich text - the post itself.
this means you can't create a fully designed list of posts and can't fully design a post page.
the cureent post page is so unflexible. you simply can't create with it. it matches only one type of design. its so UNWIX.
at your old system you had many cool modules like tag lists, tickers, thumb size lists. and now you have nothing. you only get that full page blog box.
the whole idea of wix is the ability to create a site that does not look like your other wix site. well once you need a blog you are doomed.