Not much better than a porro prism binocular like the Leupold Yosemite 6x30. Porro prisms used in traditional angled binos (including the Leupold Yosemite 6x30) are born optically superior to the roof prisms used in modern straight tube designs.
Roof prisms require expensive coatings to more fully internally reflect light and so you need to go expensive to get extra bright view. Silver coatings are brighter than aluminium coatings but then require protection from corrosion and on it goes and price goes up. Porros on the other hand require no aluminium or silver coating to assist internal reflection and will transmit light as bright as the best silver-coated roof prism. Porros also allow wider separation of the objective lenses, giving you a more "3D" view of things closer up. Porro's one disadvantage is heavier weight, which in a 6x30 is cancelled out by lighter lenses elsewhere in the binoculars. Much of the weight in 10x binoculars come from needing thicker lenses to bend light more, not from their prism systems, for example those Yosemites weight about 480grams, not unusual to find 10x42 straight binos weighing 750grams. But once you go big magnification you really need to go straight tube roof prism higher price level, unless you don't mind weight.
Surprising low price label, I would get a pair but already have some Zeiss glassed 6x30s.
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