I have in the last year, been using Neopan 1600 with more than moderate success. I use it for low light situations instead of my current standard film, Neopan 400.
If you go to my gallery, you will see one picture of one of my brothers. That was shot on NP1600 on a cloudy dull day in a backyard. You will see that there is quite nice contrast, it was printed around grade 3.
One of the advantages of the Neopan family, is that you can develop NP400 and NP1600 together, according to Fuji. I have done that, it isn't that bad, but I tend to think NP1600 requires slightly less development than NP400.
I tested the film and found that with my preferred developer, D76 1+1, I got the best pictorial results at 800 asa. I did push the film to 1600 but there really is a fair bit of shadow detail loss, by comparison.
That said, the film does push quite well to 1600, you will have to test.
Mick.
By the way this film is still available in 30m rolls from Megaperls in Japan. In March 2007, Fuji will cease to supply this film in bulk rolls.