I have used it for a bit. Its quite stable and works well.
The major downsides I found are when updating to a new version the themes tended to change slightly from version to version and changing the text in some parts involves editing a file while some parts can be done from the control panel, this means having to edit that file and the themes again after an update.
As its still technically a beta these problems will hopefully be sorted as it becomes more complete.
The site I had wasn't going anywhere so I ditched it for now so I can't actually link to an example of it in action.
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