New Pololu-Style driver ST820

Hi,
on some aliexpress stores a new Pololu-Style driver with ST´s ST820 chip has popped up.
It supports driving your motors with up to 45V which is kind of massive (would be cool for Nema23 in CNC use)
and supports REAL 1/256th microsteping which is IMHO the only Pololu-Style driver whith this feature.
not even the TMC2xxx drivers have real 256 microsteps, they take 16 Microsteps and interpolate them internally and
drive the Motors with 256 Microsteps.
To be honest 256 Microsteps is also kind of overkill and our Nema17s won´t be able to resolve them repeatably
but the feature is there, and I bet they will be as silent as the Trinamic drivers.
The driver is also quite cheap, 3.29$USD and keep in mind that the price will surely drop with time.
So, I think the chip will surely be a competitor to at least the TMC2208 since I bet it will be quite silent,
it does not support the back-EMF sensing StallGuard(TM) feature which the fancier Trinamics have
but then again, 3.29$ is quite cheap.

What do you guys think about the driver chips? Has anyone actually used one?

Aliexpress store link