I love mine. Had it for years. Depending on the powder type ie ball, long cut etc it may throw a charge +/- .1 or .2 over. Seems to be worse with powder like varget. The smaller and more uniform the powder the more consistanly accurate it throws. I just set it to throw .1 to .2 less than desired and use a hand trickler to finish.
I dont think its the dispenser, just the way the powder falls out.
WAY better than the beam scales in terms of speed. Ive run mine beside the RCBS and I think they are equal in terms of throwing the occasional over charge with varget anyway.
Lymans customer service is great also