I use them often, day and night. Comments same as Leica and Zeiss. I found the focusser to be too far back. Not as sharp as Orion 10x50's. The sharpest binoculars I've ever used.
Stars show as beautiful jewel-like points.
These were my most-used astronomy binocs until I got the Canons below. 38 oz with batteries, very sharp optics. Nikon Zoom 8 to 16 x 40. 5.2 degree field at 8x. I've often read that zoom binoculars are not as sharp as fixed power. That's probably generally true, but these Nikons are just as sharp as any fixed power binocs.