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Gday Mark,
I have the Burgess Binoviewer (with 20mm EPs) and though I can get them to focus on my refractor and LX90, they just miss out on the Dob. I have not noticed any increase in mag when I have used them but I will take another look and see if there is any noticeable extra mag.
I found that the BV worked fine on the Dob if I used a 2x barlow though the extra weight up front needed a fair bit of counterbalancing.
Mine came with a little slip of paper (that I have subsequently lost) that mentioned a 21mm clear aperture and it was the prisms that were the limiting factor and that some prism clipping? could occur. I haven't seen any negligable light falloff off axis but you might notice something if you have a serious wide FOV eyepieces.
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