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I've owned Burgess BV125 and Siebert BN 22 (briefly before returning it). The Burgess was the better unit in every way. There was noticeable degradation in sharpness and contrast at high powers compared with single EP view alone but still a fantastic experience to be able to use both eyes. Mainly useful on Saturn & Jupiter at mid-high powers - did not find it so useful on DSOs mainly due to narrow tfov with the corrector/barlow needed to reach focus in my Dobs. There were some reflections / stray light when viewing bright targets like planets, which were somewhat annoying.
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