I was able to use an X Pro 1 this summer, and ended up buying a complete Fuji system -- but with a pair of XE1 bodies, not the X Pro 1. I didn't see a compelling reason to pay an extra 50% for the optical viewfinder, as in my perfunctory tests it didn't do much for me. I'd been shooting micro 4/3 for my small cameras, so I was used to an EVF, and the XE1 viewfinder is fine except for the refresh rate (fixed on the XE2.)
Then it took me several months to become comfortable with the Fuji cameras -- which is several months more than I expected
Fast forward to a couple of weeks ago, and I purchased a second-hand X Pro 1 body. It took me a full day of shooting to figure out the OVF -- exactly where it is focusing, what the frame lines mean, etc. Since then, I find that I use the OVF and the EVF about equally -- OVF with the 35mm lens, in good light, for general walk-around photography. EVF for closeups, or when I need to be sure of the exposure before shooting, or with the longer zoom or the 14mm.
I'm looking forward to the next firmware update, to see how much more accurate the OVF framelines might be. Plus being able to set a minimum shutter speed in Auto ISO will help, though it would be better for me if they fix the Exposure Compensation bug in manual mode using Auto ISO. That would make me very happy.