I was looking at it some yesterday myself and I love the graphical look and feel of it but it seems to be missing the #1 key functional feature which is to have a topics list on the left and a reading pane on the right which is an important feature for me for rapidly reading through new posts...

I'm probably not too likely to switch to something that would require constant back and forth navigation in order to read several messages. Also it's only in beta release currently and not in stable release as of yet.

- Michael