Three screws is best, and two rods. Three points establish a plane, two points establish a line. Anything more is just unneeded constraints.
I have done 300mm/s on a huge prototype foundry pattern on infill. But for outside surfaces these speeds are unsatisfactory IMHO. Also I wonder what their proprietary high pressure extruder is, my guess is a knockoff BondTech like this is a knockoff Ultimaker. But I may be wrong, time will tell.
I’d still question exclusively using lead screws as Z linear motion guides, as you will get all the Z-wobble artifacts in your prints if your Z screws aren’t perfectly straight