Tom Westbrook wrote a review of the Gnassgear darkcloth : http://www.tomwestbrook.com/Photogra...cessories.html.
I join a "commercial" picture of the darkcloth from their website, the only one I have. But the darkcloth itself is much more impressive than on this picture, very well designed and manufactured (as all Gnass products).
I could take some other photos of mine on the Linhof and send them to you, if you need.
IMO, avoid all darkclothes with lead weights. If you are outside, with a windy weather, these weights can hit either the groundglass or the lens and break them.