Has anyone seen the two great bands of jupiter in these?
This might be difficult because of the low magnification and brightness of the view due to the large objective lens. However the 2 bands have been detected in 25x100.
They are easier to see in 30x80 binoculars, because of the larger magnification and dimmer views
The best views are in reflector telescopes with larger magnifications and bigger apertures. I have seen some magnificent views i an 8 inch dobsonian
I agree with the previous comments. To be able to see jupiters bands you need a scope with larger magnification. I can see the bands clearly in my skywatcher heritage 130p telescaope at 64x. The image is crisp but even at 64x the planet looks quite small. The 2x barlow lens that was included with it is useless, and can't bring the image to focus. But even at 25x you might be able to glimpse the bands. Remember the image is very bright in large binoculars, and the light can wash away any detail on the planet. That is why a 30x80 binocular can be better because the smaller exit pupil will give you dimmer views.
It should look something like this in 25x100 binoculars
It should something like this in 25x100s