I noticed Trail Boss on the shelf in a LGS over the weekend. It's out there again.
I never cared for Trail Boss myself, and I'm a dedicated cast bullet shooter. For "backyard plinking" loads in centerfire rifles, I use Bullseye/Clays/Red Dot with which I can get two or more times the number of shots (at the same velocity) per pound of powder versus using TrailBoss. Not a very good bang for the buck, IMO. It's main use to my thinking is in large capacity black powder pistol cartridges when building low pressure smokeless loads with a bulky case filling powder. If that is an important issue, which it is to some though I don't know why.
