Mine works well enough. ± .1 is what it does. Problem is it will always tell you its dead nuts but the beam scale will call it out as a liar
If I want to be real precise with charge weights, I use it, then dump its pan on the beam scale to verify and adjust as necessary. I rarely do that since the time isn't generally worth .1 gr, but on occasion. What I find is it's generally dead on 50%, a little light 40%, and a little heavy 10%. It has never thrown more than .1 heavy and not caught itself.
But, it has to be mounted on its own bench or shelf that isn't disturbed by press movement, can't have any aiflow like a nearby open window or HAVC register (nearby = same room), frequently needs zeroed (not full calibrated, just hit the zero button), and the "fast" speed setting is useless for any powder, any charge weight (that I've tried) - it will go over and error continually and no idea why it even has that setting......
It handles IMR 4895 really well - a lot more consistent than my Dillon powder measure or Lee Pro Auto Disc can do. I don't load huge amounts of .308WIN but when I do, I'm using the Hornady dispensing scale.