Hickok45 sure swears by it and mentions it in videos. As you implied it's very well thought of for black powder cleanup but that could be mainly because it's been around forever.
Sorry, I've never used it so no firsthand experience but am interested in what others say.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek