Sturm, it just seems to be more closely machined and tightly fitted. The edges are very sharp on the drum, and I assume it is cutting the powder in the way easily since the effort to cycle it is low and operation very smooth. Between the baffle and smoothness of operation it just drops consistent charges, even with stick powders. The micrometer adjustments are nice, and very repeatable.
I've had just about all the powder measures out there under $300 and this Redding is by far the nicest one of the lot.