I fit a lot of solid surface countertops and I have 3 x seam setters, bought 10 years ago (I think) for around £250 the triple set. The one in the video is (in my opinion) vastly over-the-top, containing a bunch of solutions to non-existent problems. Mine use the same type of suction cups as the ones used to carry around sheets of glass or paving slabs. Once you place a cup on the surface, depress it to squeeze most of the air out, and flip over the lever - it's going absolutely nowhere. They're literally impossible to pull off either vertically or laterally. The setters have a pair of vertical screws which set the exact height of each piece to be jointed, then once the joint's been positioned and injected with color-matched acrylic resin, the two halves of the joint are pulled together using a regular screw such as you'd find on a sash clamp. Squeeze-out is cleaned off using a plastic spatula, and once set, the seam is wet-sanded using progressively finer grits, followed by 4000-grit dry diamond polishing = perfect, 100% invisible joints every time. The setters have 4" of clearance under the screw clamp to get your spatula and your hand underneath.
With the one in the video, when you pull the joint together, how are you supposed to access the top of the joint to remove squeeze-out? How does the spatula and your hand possibly fit underneath all of that stuff?
Hard pass for me.