I have the set up. To be honest, it all seems overpriced. I mean, it ends up being a lot of money for most some 3D printed ABS or maybe vinyl products. The 3rd leg is a basic pole with a 3D printed piece on it that the 3rd leg adapter clamps to. Then on the top of that 3rd leg is an angled 3/8” stud that you would attach your ball head/pan head too. Once you buy everything you need, it’s a lot of money. That being said, it is nice to have one extra pole that allows you to then have an extra tripod on your trek. The saying two is one, one is none, is true but I like to be able to have things that serve dual purposes to cover that adage since you can’t just carry 2 of everything.
All in all, it works pretty good for optics and would work in a pinch to even shoot off of. I need to use my backpack or something else as a solid rear rest to be able to shoot more than 300 yards with it. It’s NOTHING like a proper carbon fiber tripod for shooting.