I've used Unique on and off for about 30 years. I can't swear about the 50% part, but I do believe that it is cleaner. I take what I read in the gun rags with a grain or two of salt since most of them have never seen a product they didn't like! Gotta keep those advertising dollars coming, you know.
I am using Unique right now and I can attest to the fact that it is 50% cleaner. I am getting great results. I found out about the new Unique after seeing the results in my 28ga skeet loads and being amazed at how clean it was. Here's a link to look at some of my targets and see my .45s reloads results with the new Unique. http://www.1911forum.com/forums/showthread.php?s=&threadid=8932
[This message has been edited by bowhunter (edited 11-26-2001).]
Bought a pound of it not long ago and noticed the label said "cleaner burning." After shooting quite a bit of it, I'd say it was no more or less dirty than 231 or Universal. I'll be buying more, that's for sure.