This is fun to mess with, either by leaving it on the table and using a finger to move the marble around or by manipulating it in your hands/with gravity. The marble moves smoothly, it isn't falling down the channel entirely on its own but also isn't getting stuck at all; the channels are sized pretty perfectly. The fabric is cute, (I got the "live, laugh, fuck off" and "fuck off" varieties) and the cuss words aren't too large/are blended in enough that I don't feel worried about using it in public. The fabric also doesn't feel scratchy, I would compare it to something like a pillowcase almost? My only complaint would be that it's a bit smaller than expected. There aren't measurements on this listing, the others list it as 5" by 4.5", but mine is a bit closer to ~4.25" on both sides. That isn't a major downside, it's still a decent size and I assume it's because of the handmade nature of the item. The stitching is also really solid, I've already tugged and twisted it quite a bit and I don't feel them shifting or loosening at all, so it can definitely put up to some rough use.
