I sprung for one of these with Black Friday pricing. It's heavier than I expected (that's a good thing, TBH). It came with 2 allen wrenches, and no explanation, but it seems pretty evident that it's so you can set the ease with which it spins.

That's where the issues arise, though. I like a more free-spinning feel. I tried loosening the screws on one end, and they don't turn well at all. Feels like they were stripped when being assembled. But that's okay(ish), cause the ones on the other end work right. The problem there is that if you happen to use the spinner "wrong" (I guess) and hold it at the ends by the screws, they aren't tight enough and so they work themselves loose within a few minutes.

I feel like some sort of cap on the ends would prevent the screws from being exposed at all times, and thus would prevent this issue. As it is, I now recognize that I need to keep the allen wrenches nearby at all times.

My last complaint on what is generally a pretty good product in concept - in order to be returnable, I would have had to purchase the ability to return it. Which is not a pattern I've seen at any other retailer. So I guess I'll just keep this one but I probably won't be buying another thing from ONO.

Very satisfied, the weight is perfect however I would like to customize my Stainless Steel Ono Roller with black end caps and bolts.

The weight, smoothness, silence and precision make this a great fidget.

Solid roller, smooth movements, focuses the mind. Wish it cost a little less.

I really liked it but it felt a bit underwhelming for that pricing.