I’m a huge fan of K&F products, especially their lens filters (I have five filters that stay permanently on top of my lens). I decided to try this clamp to see how it would perform for creative shots in the future. The product feels solid and not flimsy, as the entire clamp is made out of aluminum. It clamps well onto railings, edges, and other areas where you’d want to place it.

However, when using my iPhone 13 Pro Max, it does feel a bit unstable since the weight causes the clamp to shift slightly. Another issue I noticed is that when using the leaning feature during horizontal shots with the phone clamp attachment, it sometimes rotates on its own, as if it cannot handle the weight.

That said, I found a nice alternative use for it as a makeshift camera strap attachment to my helmet, which worked surprisingly well. The only drawback is that if you’re moving around a lot, the locking mechanism can loosen itself, which may cause your phone to fall off. This isn’t a major issue, though, since you’d typically use this clamp in stable environments.

Overall, for its price, I’d give it a solid 4/5. Just be aware that if you’re using a larger/heavier phone like the iPhone Pro Max, you may run into challenges that you wouldn’t face with a smaller, lighter device.

Edited; KnF reached out and gave me a refund for the product. At the same time I've given the clamp to my friend who has been using it with his GoPro and have zero issues that I've mentioned above. Incredible customer service and would definitely buy from this company again in the future. 5/5 Stars.