I have been using it for a few years now, especially in my .223 and 6.8 ARs. It seems to be friendly to use, meters out of my Dillon powder measure +/_ 0.1gr. It seems very clean burning. I don't use solvent on the AR's internals, just wipe of residue's with a dry rag, and oil the parts. I haven't been loading for speed, but I get great shot to shot consistency. I even decided to load up the .44 Mag with their 209 black powder substitute behind 200gr cast semi-wadcutters. What a hoot!