It's really difficult to decide whether or not I like Vox. On the plus side it has lots of good community features - a social network within the context of blogging - which I think will appeal to a whole new demographic from MySpace, bebo etc. It also has some nice features for inserting photos, audio and video which are easier to use than inserting HTML.
On the negative, however, it won't let you insert HTML. This means that, for example, you can't put third party widgets in a post. As far as I can tell the API is also closed which is really irritating.