There’s a bit of a paradox at work here. If you shoot a lot of video on your iPhone, a tripod mount might be quite convenient. On the other hand, if you shoot a lot of video, why the hell are you using an iPhone to do it?
While I do like photography accessories, and threaded things in general, I’m not sure I can fully approve of this case. It’s bulky for one thing, ruining the sleek profile of the device, and the benefits of having a 1/4″ threaded mount on it are dubious. And lastly, why is the mount on the edge of the device? If you’re using a little portable tripod (like that pictured), 80% of the weight is going to be hanging off one end. Not dangerous at all!