My daughter's bike has a 10 year old DIY system and still functions perfectly even after three trips to Burning Man and its oppressive sand/heat environment. My BBS02 equipped bike (given to my son after six or so years) still runs strong after eight or nine years, and the new one replacing it has been perfect for the past two or three years. I think individuals regard the Chinese as backward when they probably have the most modern equipment of any country.