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I have a prototype piece from when Warburton released their copy almost ten years ago or so. I was fortunate enough to get it for next to nothing and it was sent to my college professor first because he was a Warburton rep. I can tell you that the outside design and rim are very reminiscent of Helleberg and the cup shape is a very pronounced funnel with no cup. The backbore is huge and open. It has always been in my lineup and plays great. It has a solid feel and matches well with my Eb especially if I am doing large ensemble stuff. A few months after Warburton released their standard model they put out a larger version for big contrabass tubas.FWIW