First of all, thanks for posting this. I have been looking forward to a port of sshfs to OS X. I was expecting it to be based on FUSE but from the description it seems to be based on something called URDFS.
I am usually a little wary of installing kernel extensions, but I bit the bullet and did it and it worked. Mounting a remote directory over SSH worked as expected.
However, it is a little slow. Even a simple 'ls' took 2 seconds. Loading a small text file took almost 3 seconds.
I'm pretty sure it isn't my connection (I am on a high-speed low-latency pipe -- and pure ssh works smoothly). At present, a remote SMB connection over a SSH tunnel is still much much faster.
But this project has a lot of potential and for that I have to give it 4 stars.