I was rather excited for this product alongside my fidget cube; and I've been using both ever since they arrived. I feel this item looks nice and makes my fidget cube more comfortable to hold, but quickly ran into issues with the ring for the keychain to attach to, with it having snapped within only two or three hours of use.
I was sitting down in a chair with my cube attached to my belt-loop and it happened to get stuck underneath the chair. When I tried to sit up, I heard a snapping sound with my cube on the floor, and noticed the ring for the keychain was broken and I could no longer attach the keychain. This ended up being a big bummer for me, as the keychain component was the main appeal of this item for me, and I've been carrying my cube around in my pocket since.