here is a link to the device
http://not-just-threads.com/item_114/E-Z-Winder.htm and here
http://www.allbrands.com/products/abp17020.html
there don't seem to be many reviews of the product. however, one different site was talking about the EZ bobbin Winder and users were having troubles with it. from the pictures on the sites above, it doesn't look like the thread is wound evenly on their spools. personally, i don't think i'd try it.