Yes, I had seen your thread on ZX1 and must admit this is the first time I ever heard of it. I did do some research and certainly, people like yourself who have used the product seem to be pleased with it. I also note that the company states very clearly that this is NOT an oil additive (which was my area of expertise amongst others) but a surface modifier.
I can see there may be some benefits from using this in an older engine but I certainly wouldn't put it into a brand new engine. It is important when running in a new engine that there is some wear that occurs as the piston rings pass up and down the walls of the engine cylinders. The cylinder walls need a degree of surface roughness to allow the lube oil to adhere to the surface so that it can form a seal between the metal surfaces of the ring and cylinder wall. If the rings cannot bed into the cylinder wall because it is too smooth then I could see whilst friction might be reduced to a degree and evidence itself though improved fuel consumption some extra lube oil might be burned, because it couldn't adhere to the cylinder properly, causing the sump level to drop. That is specific to ANY surface modifier, not just ZX1.
I have never been convinced by any additional additive/surface modifier except perhaps in the oldest of engines choosing instead to ensure the engine has the correct grade of oil in it and that we use branded fuels rather than supermarket fuels for the majority of the time (.....but that's another story).
I certainly wouldn't argue against ZX1, it's just something that I wouldn't use...but that's an entirely personal opinion. If your experience is positive then there is no reason why you wouldn't use it.....except in a new engine
