There are probably a lot of us here who would look forward to hearing your take on the Curio after trying them out. You've got one of the most simultaneously sober and experienced views on the forum, making most of your posts among the best in any given thread....I've never so much as looked thru the Curios! I've kicked around getting some BUT.... the 25mm and less format isn't the most used group of binoculars I have.
Personally, I think that you may well find yourself using a 21mm binocular more than expected if you happened to find yourself in possession of the little Curio.