Review (4/5): Working well for my moisturizer
I got this to apply moisturizers and toners that come in liquid form and are sometimes sort of awkward to apply. This method seems less wasteful than a cotton ball. So far, this is working pretty well for that purpose.
The jade ball is nice. The bottle looks like glass but I think it's a thick plastic and it has measurements listed on the side. The black top is plastic, and I'm hoping that holds up, it might be a little thin where the roller is. Where you screw and unscrew it, that feels a little weak. So far it's holding up okay, though. There's also a clear plastic lid. The product page seems pretty serious about keeping the bottle stored upright, but the box doesn't mention that. I can see how fluid would come out though, so I'm not pressing it.
This seems pretty good for my needs and I'd recommend it. If you need a roller for something you have to refill often, you might want something with a stronger screw top, but for a thin toner or moisturizer this is working well so far. I'll update if I have any problems.