Howdy! Thank you. I love the Sprocket Rocket.
With the camera in general anything under 400 ISO I havent been able to get any effective results. In doors you pretty much dependent on a flash. Ive shot Ilford 3200 indoors, with decent ambient light, and had decent results, but its sparse. As for brands of film, you really have to test because each brad will have different codes or titles in the sprocket space that isnt traditionally exposed by other cameras. Fuji has some different color bars which you can see in some of my earlier stuff (here). Some people like that look, but I ended up liking the minimal information that Kodak uses on the portra series.
Feel free to ask if you have any other questions. Ive done lots of experimenting with it and have lots of notes that I am happy to share.
Derek