I discovered this film was usefull somewhat by mistake. It was the first film I ever tried to use for astrophotography. I took some very wobbly star trails from in the back yard of my flat in Christchurch. The photos were badly contaminated with light polution and I put them in a box and forgot about them. Once I got into astrophotography I revisited the photos and was supprised to see that the film had a reasonable H alpha response.
This is one of the easiest to find films in New Zealand. Almost every dairy has a few rolls behind the counter for about $10(NZ). The film is slow (being 100asa), it is noticably slower in short sxposures but it seems to do quite well in longer exposures. I have not done any standardised Reciprocity Failure tests but I think this film should have good reciprocity characteristics. I have found that this film is the only good film from the Fuji's "4th colour layer" range but I have not seen or tested the 1600. Aparently the 400 speed Superia was a good film for astrophotography but the new Superia X-tra 400 and 200 speed films I have found have no H alpha response. The 400 speed film however is still good for aurora and such where H alpha detection is not required and speed is important.