Hi Giorgio
I had a set of 30x100 lower end binoculars for 20 months - around the $450 mark - they looked much like these.
http://www.iceinspace.com.au/forum/s...ad.php?t=49104
I never did see the detail in Saturn's rings that I wanted to see, nor the individual stars in the centre of globular clusters - they never had the resolution. Maybe a $2000 set would have? But the views of starfields, open clusters, nebulae were quite lovely.
A couple of comments:-
1. They are big and they are heavy. You will need a very robust alt/azi mount to support these.
2. The field of view is narrow enough to make it quite difficult to locate targets. This is not the simple point and scan a bit that is possible with 10x binoculars. I had to mount a red dot finder on my binocular mount to help me locate objects.
Eric