I think you'll like Promo when you use it. One caveat that I got from Alliant about it is that you should shake the jug before taking powder out of it, so that the larger grains don't separate from the smaller ones. I shake it before I use it, then shake it again after I put the unused powder back in it. If I miss it one time, I've done it the next time.
I've been using it mainly in .45 ACP and .45 Colt, but I haven't found many calibers that don't work well with it. I agree with whomever mentioned it that Promo/RedDot tends to burn more cleanly when pushed hard, but I get that from most powders. I haven't found it to be a terribly dirty powder in any circmustance. At its worst, it seems no less clean burning than Unique. Both burn cleaner as pressures rise.