These needles are pretty good, but I prefer the Knitter's Pride Brass Cubics to these. Somehow the metal of KP Brass Cubics feels smoother. The stitches move across the surface of the needle better than on the Addi Turbo's. I think the join on the KP's are slightly better too.
My biggest complaint with the Addi's though is that printing the sizes on the cables is so stupid. It's fine at first, but after a couple of years the cable clouds so much that you can't read anything on them at all.