I bought some and am currently testing it in 38sp. So far the velocities are pretty high compared to other powders and it seems to be clean. I am using Berrys Plated 158gr and my 38/357 test gun, a Ruger Blackhawk. I had to buy a new chrony so it is taking longer than I wished.
Promo is my primary target powder across all calibers. Cheap, works great and goes a long ways