The holzfeller is basically a diving brick with holes in, strong like ox, light like ox. I do like mine but it’s a bit specific.
The On One I think is the one that the faceplate’ll definitely snap if you get a Superstar one and it’ll be unfit for purpose, but will be fine if it’s On One and if it does snap it’ll be your fault 😉
(on a similiar note, Future have reviewed it twice- when it was Superstar it was a 2-and-a-half star, and “There’s noticeable give when you pull on the bars, which isn’t ideal.”, then they reviewed a longer version branded as Sunline, £25 more expensive, and all of a sudden an extra star and “The main body of the stem is squared off rather than purely round in cross section, adding torsional stiffness. We didn’t detect any hesitation in the steering out on the trails or flex while hauling on the bars during climbs.”)