You will loose half your photos.

I am using Silent Sifter for a simple task: Connect iPhone, Connect USB Drive, Copy pictures. Apparently this app can not handle it.
No matter what is the destination folder you choose for import, this App does not care, it will copy it all to your primary drive, and then try to copy it to the USB.
Where it gets really bad is, even if you have space on the USB drive, but no space on the primary drive, the app will just import SOME of the photos.
But it gets better, the app will tell you ‘Import was successful’ even though half of your stuff isn’t there.
Crazy.
I would never trust this developer with your photos.

binary? about Silent Sifter