I have a Monolith Conical and it's a great grinder so the bar will be really high to be considered its peer.
But the Helor Stance does look pretty good & very promising. I have briefly tried the Helor Stance's prototype (manual version)
and it was pretty good. Alignment and construction were very solid to my eyes. The only quibble at the time was I suspected that the Italmill burrs was the weak point (seems to taste a bit brighter than my Pharos/Robur and I preferred shots that are less bright/more balanced - just personal preference). Now that I see that the Helor Stance Motor comes standard(?) with the Mazzer Robur burrs, this could indeed be a viable alternative. Perhaps I could ask nicely for a review unit and compare it to the Monolith since they are also located in Melbourne.
In their demo video, I can only hear the sound of beans crushing, and not the motor. And from memory, the manual version of Helor Stance was very quiet. So it's a good sign!
Most importantly, the motor eliminates the problem with cranking light roasts (i.e. typically a chore especially with manual grinders like HG-1 and to a lesser extent with geared-down grinders like Kinu M68 or the Helor Stance) and should result in a more consistent RPM (no jerky action with light roasts). So it should be an improvement over the manual version. Wonder what's the watt rating on the motor.
In terms of taste upgrade, it'll definitely a huge upgrade over your Mazzer Mini if you're drinking espresso. Even with the brighter taste profile, I preferred the Helor Stance prototype (due to more clarity) over the Helor 101 I have that's supposedly to be 'better' than Mazzer Mini based on others' experience.