I am using the Xpan II with 45mm lens since over a year now (bought the last brand new item from the Hasselblad importer in Austria). This camera is simply amazing. Never would I have thought that panoramic pictures could be so breathtaking. It is like discovering another dimension of photography. Plus the fact that you can use standard 35mm film is a bonus in terms of choice, availability and price of films.
I have used the Xpan so far with Fuji films (Superia 200, Reala 100 and Sensia 100). If your end result is prints, I would advise to use negative film right away. Better results can be obtained from negative film as compared to slide film, in my experience.
Here we touch upon another important issue, and the main problem for Xpan users: the choice of a good photo finishing lab. Developing is, of course, easy. But remember to indicate that the developed films should not be cut since the image spans over two regular 35mm shots. Not so many photo labs actually do offer Xpan service. Moreover, prints don't come cheap. I usually print in 10x25 cm (1,70 euro a piece).
I am using the camera with satisfaction as a complementary system to either my Leica 35mm systems or to my Hasselblad H1 or Rolleiflex 6008AF MF systems.
Too bad scanning is such a problem. At least, high-end scanning, which would require a scanner like the Nikon Super-Coolscan 9000. For web purposes, a regular flatbed scanner would of course be enough. Equally expensive would be to project panoramic slides. Only few slide projectors are able to project Xpan slides (among which Götschmann and Rolleiflex).
Pascal