I've been using Redding dies for years and have no complaints. I recently bought sizing dies for my 6mmFat Rat and 6x47 Lapua from Whidden and I think they're terrific. I went the Whidden route on these two cartridges cuz I wanted them to accept neck bushings and tolerances that better matched my fired cases. They provided great service at a reasonable price for what I consider custom work.
Kevin