After testing this on my Xperia S & XZ1 I found one bug, when switching to night mode the camera freezes & won't start in XS, I tried switching between different modes & night mode & successfully got my camera started on night mode but after a wait for few minutes which is kinda strange. Then I tested this App with my Z1 which is still running android 4.2.2. & everything works fine. Both devices came up with excellent pictures, I thought the HDR mode is only for XZ/XZU & XZ1 but it did a great work with my Xperia S.
The only bug I noticed about this app is taking pictures in night mode, both XS & XZ1 came up with a blurry picture when trying to shoot a close object using Macro focus...