I jumped on an 8 pound jug back when powder was very scarce. I then bought a 1 pound bottle for testing. If I liked it, I'd be set, if I didn't like it, I could have easily sold the jug for what I paid for it. As it turned out, I liked it very much for 9/40/45/12 gauge. At lower pressure loads, it's quite dirty and smokey and stays that way right up to max charge weights (max normal, not +P range so there is still some safety margin). When loaded near max, velocity spreads go way down like in single digit fps.
For 38 special, if you aren't loading the bullets to full 357 pressures, the loads will be pretty smokey because the pressures will be quite low. The cases will be sooty and you'll get a lot of smoke, but they'll shoot fine.
It flows very well and yes it takes up very little room in the case so it is easy to miss a double charge if you aren't careful. It's really smokey with traditional lubed bullets and Alox, but not smokey at all with powder coated, plated of jacketed bullets so long as you are up there in the pressure range. It shoots very well in 12 gauge for my 3/4 oz skeet loads, buckshot loads and slug loads. Some say it burns hot due to the high nitroglycerin content. I don't shoot rapid fire (no more than 1/second) so it's no problem for me.
If you can get it for $16/pound, you are getting it for a little less than what you would pay for if you bought it in the 8 pound jug. I got my jug for $138 + tax. You certainly won't lose out because you could easily sell it for that price immediately and maybe even more if we have another powder shortage.