I really like this app. One of the things I like about it is I can get a really realistic view with the many adjustments that more closely match the naked eye view. I end up using it a lot to get photos of subtle images of skin conditions for a relative who has medical problems. Sometimes a more accurate photo is needed than you can quickly get from a standard phone snapshot. An HDR program like this can provide that extra level of detail with a little tweaking of the image immediately after taking the photo.
Greg k about Fusion - HDR Camera