Now no way am I an expert in this field (most of my mountain flying has been done without benefit of engine, which does at least teach you about wind appreciation) but:
I am worried by Arm Out the Window's reasoning. If, as he says there is a 'demarkation line' somewhere above the ridge where all is fine and easy, the first time that he is going to find out about conditions at the LZ is with 100' to go on a steep approach. Next time someone is showing me how to do it I hope they follow 170's pattern
OA