S is like the cheaper version, while Xi is to replace Zero, which is the better version with mostly metal and graphite parts. I suppose the durability is the same as Zero, which means better than S.作者: romeochris 時間: 2011-6-27 15:25
But I saw Kei's motor mount has been replaced twice....作者: AbarthJoe 時間: 2011-6-28 00:21