I'm so tempted to get one, but I struggle with the the Oly 17mm fov, so I keep thinking I won't be able to get on with the wider angle! With the cash back offer I can pick one up for £285 at the moment though!!!
You are a longer focal length guy, obviously. If you got the 9-18 on your camera, though, and started doing a bit of work in the 9mm range, you might find it was better for you than the 17mm, simply because it is so far out of your "normal" zone, you would have to consciously look for pix.
FOREGROUND is the great thing with such a wide lens. Look at the OP's post. His first pic is good, but his second pic with the fence rails is a superb example of UWA photography.