i just had a bit of a nightmare for my first blind but CT customer service was bang on amazing.
wife bought me the razorblade or whatever the intermediate model is called. first one had a pull string and the arm snapped from the plastic immediately. i figured it was a defect and brought it back. same thing happened.
explained the situation to the manager at CT and he gave me the brickhouse. different mechanism and it's solid. used it yesterday and i'm more than impressed. for 129 on sale you can't go wrong.