I've never had a problem with 50-minute connection (unless the flight is late then you're out of luck.) Even if you are reduced to 30 minutes, CX will usually send an agent to meet you at the gate, escort you to security (cutting to the front) and then escort you to the departure gate.

But at the end I've gone away from it because it's great most of the time, but it's a pain having to wait another few hours for the next flight, especially if subsequent flights are full themselves.