In brief, my personal opinions about this DF64 /G-IOTA are positive, for the price that will be sold in EU, is a good deal.
I will not issue rocket science data...but simple facts i saw during the trial.
Here the final destination of this grinder will be more for commercial use than domestic, so i had to approach in a different way.
I suspect will work better with medium light beans, i personally had few issue at the beginning with dark roasted ( a lot of fines and a lot of statics), but only after 4 kg of coffee i saw a great improvement.
In my specific case ( dark roasted, brittle and oily beans) i had to remove the anticlumping plate to reduce the retention, that in a normal routine is average 0,3/0,4 gr.
I even get quite often a zero retention but always with the use of the bellows, without use the bellows i stay within 1 gr ( always without the anticlumping plate.
I never provide for RDT during my trail, i only wanted to see the "real" performance, but once i did i got better result in term of statics reduction.
Sometimes a single bean had stuck on the lower burr carrier, funny that was free to move but was not getting crushed, i think it's simply a coincidence with the beans dimension ( i use a blend Arabica/ Robusta).
To pour the coffee beans I prefer to remove the whole bellows instead of only the bellows lid, is more easy and fast.
Maybe is because my coffee quality or the not well seasoned burrs but i saw that after grinding, there are, not much, but quite noticeable quantity of flakes attached to the beans chute, i don't know if it could be even a "sucking" effect of the bellows once released, so maybe it worth to try to push the bellow without the lid so the hand will not "seal" .
I did had not well result once grinding directly in the portfilter, but again i think it was due to my coffee quality, ( moreover i'm not using the anticlumping plate) in effect i can't properly dose in the portfilter due to some ground dispersion, but i can survive with it, unfortunately my unit was not supplied with the dosing cup, but i used a simple steel jug.
At the beginning i had to regulate the grinds more time than normal, i suspect that the new stock burrs it has producing fines.
As well i got some chanelling at the beginning, but now all is ok.
Replacing the burrs is easy, as well a periodical cleaning of the burr chamber, especially due to the absence of screws, even inside the burr chamber.
The only thing i will change is the ground chute, i will prefer it made in steel, but as i said for this price i can't pretend too much, it's works well, i don't think that reliability, especially for home use, will be a matter.