I have one. I use it on my Hornady progressive press when I load rifle cartridges. With powders like IMR-4895 and Varget, it's easily within +/- 0.15 grains, and it does not cut powder, ever. That's not as consistent as the +/- 0.1 grain claim - most of the time it is that consistent, but for some reason I occasionally got a charge that was slightly further out when I was testing. Either way it's good enough for my uses. For comparision the Hornady measure that came with the press was only consistent within +/- 0.25 grains or so with the same powder, and was cutting powder kernels all the time.
It does work in a weird manner. It's really difficult to explain, so maybe I'll try to shoot a video when I get some free time. The thing that's hard to get used to is that it drops powder on the down stroke, not on the up stroke like most case-activated powder drop mechanisms. You have to change your rhythm or else you spill powder everywhere. For that reason, I still use my Hornady measure when I load pistol rounds in full-progressive mode.
The progressive linkage he sells for the measure works well and is easier to adjust for case height than the one that comes with the Hornady measure.
I don't have the setting gauge. I just measure the tubes with my caliper and make a note of the measurement for the powder charges I need.