Just received the F1 today. I should be able to test it out at a show soon, but for now here's some photos to show the size of it compared to the Roland R-05 and the CA9200. If the F1 works out and I decide to keep it, I may dremel off the rails to make it even smaller. Even with those rails, though, the thing is tiny.
(Gold star to anyone who can identify what these things are resting on.)