Hi Karl, Stefano & Asif,
we're currently testing wix cms. Wix is great creativity tool, but it has some serious seo problems. It's correct that their websites are flash based, but we can confirm that their content are crawlable by google. There are other serious things - users cannot add any custom meta tags in the code level (head, body), also you will not be able to change anything in website hosting level. You can add any meta title and description, but this will be applied to the whole website (not page level). So you won't have different meta titles and descriptions (please note that google may change your titles and/or descriptions in their SERPS, so sometimes it doesn't matter). It must be said that currently wix have improved in handling these issues - they included 'rel canonical' and different meta titles - now they are constructed as follow - Website title + Page name, so it may be something like "My Website | My page". Meta descriptions are still the issue. Currently we are testing this cms, so we cannot recommend to use it or not, as you may know, flash, ajax is not recommended by most seo.
Some tips: - always use so called "masterpages" - these only are real web pages
- don't read their help on seo - it's very old and there are some major mistakes (like making no difference between image "alt" and "title", recommendations to use keywords tag and so on).
