Hi rbelyell,
I have had my xpan for about 18 months now, and it is a killer camera. I've probably shot about 120 rolls of film since purchasing it, and it is a powerhouse. The 4/45 lens is incredibly sharp and full of detail. Even a screw up shot can look very nice.
I have never really turned it off aperture priority. The meter in it is insanely good.
it is one of those cameras that you keep forever and never sell.
I must warn you that framing can be (at times) incredibly hard. Other times it can be very easy. I recently shot a friends wedding on it, and so glad i shot it with the xpan, as it captured so much going on with the wide frame. But there have been times when it can be hard to fill the frame as well. But they are my short-comings, not the camera's.
All the other points of other cameras being able to do the same thing with some cropping, that is complete nonsense. You frame for the wide panaromic shot with your eye. Cropping/stitching is doing post work, and we aren't talking about that, as didjiman has said.
Best of luck, just make sure you get one that works well, the paint wears off very easily, so don't be scared away by one that may look a little worse for wear.
Here's a few I have taken ( on different film types)