I got the blue one because it matches my other rings or outfits perfectly. In addition, he looks pretty. And can be adjusted if you want comfortably.
I'm not much of a fan of rings in general honestly, but I know small details in lolita can go a long way from making a (limited wardrobe) coord look refreshed and this ring did the job. I was surprised by how small it actually came out, as the display photos made it look a little but bigger, but Mana's portrait confirmed they were the same size. It's a nice chiny blue colour which matches the new shoes released recently and my matching two way handbag which contrasts most of my black Moitie skirts and dresses very nicely.
As you can see there is a slight gap to accommodate bigger fingers too. Overall I am pleased with it and the new effect the Bat Ring has.
Not sure if this applies to all painted rings, but the paint on my black one has been coming off since first wearing it. Perhaps wearing it during normal activities, such as typing and driving, is too rough on it. Maybe it is a faulty ring among good ones.
The silver and gold colourways don't have this problem.