I was reading a thread this morning that was discussing the pros and cons of various approaches to friction shifting on double and triple setups with large span freewheels in the rear to assist with steep ascents.

And one of the posters made this comment..... "Good shifting is the result of using either Shimano or Sachs freewheels, which have great tooth designs, and a Huret or Sachs-Huret Duopar Eco rear derailleur. It eliminates overshift and will handle a huge range of gear."

I am familiar with Shimano and Sachs freewheels, but have no knowledge at all of Huret or Sachs-Huret. What I would like to know is the basis or validity of the above statement, whether this Sachs-Huret model has some advantage over other friction rear derailleurs and how that advantage occurs mechanically. Thanks for any input.