Overall, this is a decent product, but it has a few design issues that make it less comfortable to use than I expected.
First of all, it fits very well with the case and feels solidly attached. It also works quite well for watching videos when the phone is placed horizontally - in that scenario it does its job nicely.
However, using it as a finger ring while holding the phone is not very comfortable. The ring puts quite a lot of pressure on the finger, and after holding the phone for a while it can start to feel uncomfortable because the pressure point is quite narrow compared to the weight of the phone.
The stand function in vertical orientation is also not very stable. It can hold the phone, but it doesn’t feel particularly secure.
If you plan to use it mainly for watching videos in horizontal mode, this product works very well and serves that purpose nicely. However, if your main goal is to use it as a finger holder while holding the phone, it may not be the most comfortable option. This might also be more noticeable with larger phones - in my case I use a Pro Max, which is quite big and heavy.