It works but can be a pain Connecting the camera requires a switch of model a few times to get a solid connection. Once connected most is OK  the camera allows you control still to set the framing correct before starting the auto time lapse shutter. Main downside is  the app and phone need to be on for it to work  if the phone goes on standby  so does your time lapse. The picture count is a lie  it counts how many pictures should have taken in the given configuration instead of the actual count  which sometimes is less.
May 19 2015