It works pretty good. GR3 user – Image Sync Review

When you connect to the WiFi it says no internet connection. Disregard that and proceed, you’ll find that it is in fact connected. When you have the app open and you see your pictures start to appear on your phone, press play on your camera so that a picture is on the lcd screen, I’m not sure why but this seems to make a big difference. Also, you’ll probably need to change the auto sleep mode on your camera to off, I did but not sure if necessary. If you have the app running too long it will stop working and you need to close and reopen the app. I find it best to transfer smaller amounts of photos at a time but I have transferred over 15 at once.
Review by 805cakush on Image Sync.