I've got a Doinker but I don't know what model it is. It's almost new and I decided that I shot better without it. I was trying to fix my bad form with gadgets and figured out that practice and hard work will do wonders.
You can have it for the price of shipping if you want it buckee. Just drop me an IM if you want it and I'll post a photo of it so you know if it's one that you want or not. I have decided I definitely like to shoot without it.