I have! And I liked it! But Surfingkeys has 95% of the functionality of Tridactyl, but but does not need a troubleshoot guide like Tridactyl. Moreover, Surfingkeys implements a better search function on websites. With Surfingkeys, you also don't need to install an external application to work in input masks with Vim, as Surfingkeys has a Vim implementation on board that is completely sufficient for filling out input masks. I also like Surfingkeys' visual mode.
In what ways is it superior to Vimium?
Surfingkeys has much more keyboard shortcuts, implemented vimedit for input fields, better search, sessions...