Strengths: Appears to be solid, allows smooth shifting, no problems at all.
Weaknesses: The design is awful - especially the plastic plate in the middle.
Came on my Cube Analog 29 (2013) and after 500 kilometers, I have not experienced any problems at tall. No strange sounds nor bended arms or chainrings. I am riding mainly hardpack and light trails, so I can't tell if will will survive jumps or very rough terrain.