No-go for SomeWhile I was hopeful, I couldn't feel a thing when using these, no matter what I did. They're pretty and cheap, but may not work for everyone!
Let's start with appearance. These are gorgeous, tiny, little, gold balls. As some has mentioned, the case is pretty cheap; they roll around in there. I wasn't hoping to take the case out and about, so it wasn't an issue for me. I enjoyed rolling them in the palm of my hand and clicking them together.
Sadly, when I put them in, it was a no-go! I tried these a few times and did every search on "Ben Wa balls" I could think of - these recommended walking, running, rocking back and forth - nada. The one time I did try to wear them out, there was no warning before one just fell out. I mean literally none. Such a disappointment! I would imagine that, being metal, these might hold temperature well, so it might be fun to freeze them and play with them...but once they're in, I doubt I'd even feel it.
I don't currently have a sexual partner, but if I did, I think I'd try PIV sex with these in. Maybe then at least he would feel something!
Taking them out is a bit of a chore. The first time was the hardest. I recommend feeling around for whichever ball is lower, and using a "come hither" motion of your pointer finger to nudge it out. After that, you may have to go digging for the second, so if you're not comfortable with your anatomy, don't buy these!
Thankfully, these were cheap because they didn't do a darn thing for me other than add another toy to my collection. Hopefully, they work better for others, but I'm beginning to think that these are incredibly overrated.