These worked well to repair my sagging gutter that my landlord never seemed to get around to fixing. With my Makita impact driver they went in quickly and easily. Note the head is a square drive, so if you don't own one you'll need to order one as well.
I kind of wish they were a little longer (1/2" or so) to go further into the wood, but tugging on the gutter with moderate force didn't pull it out of the wood. I doubt these are stainless so rust may be an issue down the road, but at least they don't pull out as easy as aluminum nails and they're cheaper than the "hidden" screw hangers you can buy. These are all small issues.
I'd give it 5 stars if the screw heads were powder coated or at least painted well enough they don't come out of the box already scratched. Didn't really matter for my application but other people may care.