I have just started using this to syndicate from self-hosted blog to my wordpress.com blog.
After setting up (follow the procedure) it works, post also posted on my WordPress.com blog :)
However, it is a little involved to setup, I had to register two applications with wordpress.com. This process and the screens in wordpress could work a bit smoother and more intuitively.
Also my featured image didn't propagate, presumably featured image has to be locally hosted (ie. local to the blog). Solution was to upload the image on the destination site, but a little extra work.
When I verified in the "push syndication settings", the "token" didn't stay in that screen, so remember to copy and paste your token elsewhere - you'll need this to put in the site screen.
Good work guys, hopefully these issues can be ironed out.