Haven't tried it but as this is coming from WooThemes who make Tumblr-style themes for Wordpress, it's a smart move providing a tool like this.
love it, would also be cool to see a wordpress to tumblr exporter :)
Definitely agree with you here. Tumblr's already incredible growth would be even bigger if they could start stealing WP users. Maybe this is part of the plan though. Eventually allow WP to Tumblr once they can finally keep up with demand.
Hao Chen here. Great to see others move the project forward.