Does anyone use an auto feeder for attracting deer ?

I can see the appeal as you can get it to put out some food at dawn/dusk without having to leave out huge amounts all the time / always go there to fill em up.

Have been looking at this one on Bushwear -

So does anyone use them ?
What do you use them for ?

Do you have much success ?
Are they easy to attach to a food drum and what do you feed ?

Cheers guys