Well for us, they are an impovement over what the head of our electrical team did last year. We found many lugs that were just squeezed on with pliers and taped.
This year, the SLU-70 lugs tightened down, the screw is soldered in place, the little moving piece is soldered to the side, so it cant back down and the wire is soldered to the lug itself. I did most of these myself and I inspected all of them. I'm happy with how they turned out.