Swift One,
I use one for all my rifle reloading. I have had it for about a year. I noticed no decrease in accuracy versus trickling. There is some technique to it though. It throws 45 grs. for me + or - 1/10 of a grain. When testing it's accuracy I also drop 10 charges of 45 grs. and came up with 450 grs.
overall design... super
On the down side it is quite overpriced and manufacturing leaves something to be desired.
Would I buy it again? Yes, it has saved me literally hours in the reloading room.
FWIW,
308nate