I just got it a few days ago but I have not taken the time to get it going yet. I am hoping that it is a good script.
I have to admit that when I see these things - I am compelled to peel it back and see what is there. I haven't seen anything on split testing against more traditional ad formats but this is newer and may draw greater interest. It's different from the normal banner ads and hover ads that we have been programmed to ignore. ~H
I've not bothered with it. It's just a thing where you peel the site away in the corner of the screen to see the ad beneath it. I prefer to have my site as it is rather than keep flapping in the corner like the page is peeled back a little.
I much prefer these tools over those floating ads or intrusive ads that you need to click to get to the site. But, like redgsr stated, I would be careful about using anything that isn't friendly across a majority of browsers. Actually, across all browsers if you want total accessibility.