Hello Bergoff, welcome to the forum.
I couldn't find any reviews for a NH 1020 either. What I can tell you is that this tractor was made by Shibaura (Japan). Shibaura has been making tractors for many years, and they make most if not all of New Holland's compact tractors. They also made all of the old Ford tractor compacts. So quality should not be an issue with this tractor.
However, parts are very expensive. IMO, New Holland is the most expensive tractor parts source in the country.
Another thing is that Japanese manufacturers stop making parts for tractors when they reach a certain age. Planned obsolescence. I don't think this will be a problem for the Boomer 1020 that you are looking at. But if you plan to keep it 15-20 years, it could become a problem.