I've had the DPS3 for several years and have yet to see any issues with repeatability that I couldn't explain away as wind related or my mistake. One thing you should make sure of is that the unit should be flat on the bench so it can't rock.
I wouldn't have an electronic scale without having a beam scale first. I occasionally double check my electronically dispensed loads against my beam scale. They are always within .1 grains of each other.
It's also great to have a beam scale in case the power goes out in a storm which it does fairly often where I live.
"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." The Dalai Llama (5/15/01, The Seattle Times)
"That rifle on the wall of the labourer's cottage or working class flat is the symbol of democracy. It is our job to see that it stays there." George Orwell