Very good

The developer says “it will fix the ad to the top of the site while scroll down to the bottom of the site after its position at the sidebar” which means that it is a free floating ad which stays in position as you scroll up and down. If you only have a short page or you have made a small browser window then you just need to scroll up and down a bit to get it to “kick in”. However, this is a detail which affects all free floating boxes.

You will need to find a balance between the size of the image you use and the text. I have not yet worked out how to format the description text. Again, just a detail.

I think it’s a useful and stable widget and I am puzzled that no one seems to be using it!

Your ad will have a footnote “Powered by Ad Box from Medust” which seems reasonable enough.