I have just installed SEO Friendly Images on some of my blogs.
I used the default settings, apart from additionally checking the box to override WP Alt Tags.
But, the result is that on any given post all images have exactly the same tag appearing when the mouse is hovered over the image.
Now to me that isn't a problem, because all images on a post do relate to the post title. My question is does it do any harm for SEO purposes if Google 'sees' several images all with the same alt tag?