The Manfrotto and Impact superclamps have the same load capacity and, while I'm not a structural engineer, appear to have the same heft and build quality. I can't say I've ever used them with video cameras but have used both brands for hanging multiple mics on heavy extension arms, etc, and have never had a failure (knock on wood). While there are some items between the two brands where I would agree with you (ie: buy the Manfrotto), I don't think the superclamp is one of them. Comes down to personal preference and if the extra $10 is worth it to you and gives you extra peace of mind.