i doubt the parts availability would be any issue,,, because it is more or less same engine as of the 150cc and 175cc qingqi rickshaws,,and those parts are easily available,,and cheap as well,,
second thing is that qingqi has very vast network of dealers and parts,,
and regarding quality i think it will be at par of branded because most of th engine parts are made in china at qingqi factor and qingqi has got a lot of technology transfered to china in its agreements with various branded companies,, even in pakistan qingqi rickshawas are what honda is to 70cc category sans cost