I bought the Lyman 1200 DPS a few years ago and have been very happy. I manually weigh every few loads at random and they are usually within very tight parameters below .1. Accurate Enough that my 270 chrono's repetittively with tolerances less 50 fps high or low every time. less than 3/8 MOA at 200 yards.
Now I haven't loaded with it on my 300 Ultra Mag yet, as I am waiting for backordered Nosler Brass. But hopefully in February, I will have another caliber to talk positively on.
Only important factors I have found is that it is important that you not leave powder in them overnight - in case of moisture. And to do a fairly thorough job cleaning powder when you are done.
About 1 in 10 loads will go over by .1 or .2 grains, but the scale usually shows me that before I am able to pull the powder, and I just dump that faulty mearure back in the reservoir and punch out another one.