Terrible
Fujifilm makes great cameras, but poor software. Figuring out how to connect an XT-1 is a puzzle, but not the enjoyable kind. Actually connecting the camera to an iPad takes Devine intervention and haste (the app usually times out too fast). If you connect (and thats a big if), RAW shooters will find themselves looking at a message saying the camera has no images.
Suggestion for Fuji: outsource your iOS apps to real app developers who have a good understanding of user experience. UI and UX in all the Fujifilm iOS apps is terrible.
RBuday about
FUJIFILM Photo Receiver