Machined from solid metal, it has a nice weight and solid feel to it. Its a bit slow having to screw and unscrew each time you place your phone, but it holds well and is built to probably last forever as there are no springs to get loose over time, nothing to mechanically wear down or break, and in general no points of failure I can see.
There is however no allen key included so if it becomes loose over time, you may need your own allen key to tighten the screws back up, my unit was tensioned perfectly out of the box and felt smooth and tight enough to not have any wiggle.
It seems a bit pricey, but you really do get what you pay for. I was after something to use longterm, and this is definitely without a doubt it.