Best quality/price ratio of the market
I bought B100 Pro model last month in official Sihoo website. I receive it pretty quickly by postal colis, and i assembled it by myself with good video instructions in english. It missed some pieces, so customer service bring me it by complementary postal sending (they repay customs duties), and i contact them to get complementary instructions : i get a new video in few hours who perfectly help me ! In resume, i totally recommend to test their products because it's certainly the best quality/price ratio in actual office chair market.